…d API samples (#1994)

This PR introduces emulator support for the API samples, which are using admin client autogenerated methods.

**Sample usage**

For Instance samples:

```
const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner({
    projectId: projectId,
  });
 const instanceAdminClient = spanner.get_instance_admin_client();
```

For Database samples:

```
const {Spanner} = require('@google-cloud/spanner');
const spanner = new Spanner({
    projectId: projectID,
  });
const databaseAdminClient = spanner.get_database_admin_client();
```

This PR contains sample files and their integration tests for the instance admin client APIs.

This PR contains sample files and their integration tests for the database admin client APIs.

This PR contains samples and its integration tests for admin client backups APIs.

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [gapic-tools](https://togithub.com/googleapis/gax-nodejs) ([source](https://togithub.com/googleapis/gax-nodejs/tree/HEAD/gapic-tools)) | [`^0.3.0` -> `^0.4.0`](https://renovatebot.com/diffs/npm/gapic-tools/0.3.0/0.4.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/gapic-tools/0.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/gapic-tools/0.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/gapic-tools/0.3.0/0.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/gapic-tools/0.3.0/0.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/gax-nodejs (gapic-tools)</summary>

### [`v0.4.0`](https://togithub.com/googleapis/gax-nodejs/releases/tag/gapic-tools-v0.4.0): gapic-tools: v0.4.0

[Compare Source](https://togithub.com/googleapis/gax-nodejs/compare/gapic-tools-v0.3.0...gapic-tools-v0.4.0)

##### Features

-   allow passing --keep-case and --force-number to compileProtos ([#&#8203;1561](https://togithub.com/googleapis/gax-nodejs/issues/1561)) ([004d112](https://togithub.com/googleapis/gax-nodejs/commit/004d112445f528a6cb143676e8b397b37137adf3))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "after 9am and before 3pm" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

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---

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#2005)

* docs: swap existing and generated samples

* docs: swap existing and generated samples

* docs: swap existing and generated samples

* docs: swap existing and generated samples

* refactor: add missing samples

* fix: presubmit errors

* fix: presubmit errors

* refactor: integration test

* fix: presubmit errors

* fix: presubmit errors

* fix: header-checks

* fix: header-checks error

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* fix: presubmit error

* docs: update the readme

* docs: update the readme

* fix: presubmit error

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

This fix is reverting the feature untyped param type added in [PR](https://togithub.com/googleapis/nodejs-spanner/pull/1869) and released in [7.4.0](https://togithub.com/googleapis/nodejs-spanner/releases/tag/v7.4.0)

This fixes issue #2009 which was introduced by untyped param type feature.

🤖 I have created a release *beep* *boop*
---


## [7.5.0](https://togithub.com/googleapis/nodejs-spanner/compare/v7.4.0...v7.5.0) (2024-03-04)


### Features

* **spanner:** Add emulator support for the admin client autogenerated API samples ([#1994](https://togithub.com/googleapis/nodejs-spanner/issues/1994)) ([e2fe5b7](https://togithub.com/googleapis/nodejs-spanner/commit/e2fe5b748c3077078fa43e4bfa427fef603656a9))


### Bug Fixes

* Revert untyped param type feature ([#2012](https://togithub.com/googleapis/nodejs-spanner/issues/2012)) ([49fa60d](https://togithub.com/googleapis/nodejs-spanner/commit/49fa60dd0735fe66db33f7b9137dba0821eb5184))

---
This PR was generated with [Release Please](https://togithub.com/googleapis/release-please). See [documentation](https://togithub.com/googleapis/release-please#release-please).