## Summary

Part of elastic/kibana-team#1503

This PR is mostly about moving tests from x-pack/test to
x-pack/platform/test

Before:

```
x-pack/test/
     | - encrypted_saved_objects_api_integration/
     | - plugin_api_integration/
```

After: 
```
x-pack/platform/test/
     | - encrypted_saved_objects_api_integration/
     | - plugin_api_integration/
```

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

## Summary

Part of elastic/kibana-team#1503

This PR is mostly about moving tests from x-pack/test to
x-pack/platform/test

Before:

```
x-pack/test/
     | - encrypted_saved_objects_api_integration/
     | - plugin_api_integration/
```

After: 
```
x-pack/platform/test/
     | - encrypted_saved_objects_api_integration/
     | - plugin_api_integration/
```

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

## Summary

Part of elastic/kibana-team#1503

This PR is mostly about moving tests from x-pack/test to
x-pack/platform/test

Before:

```
x-pack/test/
     | - encrypted_saved_objects_api_integration/
     | - plugin_api_integration/
```

After:
```
x-pack/platform/test/
     | - encrypted_saved_objects_api_integration/
     | - plugin_api_integration/
```

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
(cherry picked from commit f93e3b0)

# Conflicts:
#	.github/CODEOWNERS
#	x-pack/platform/test/tsconfig.json

# Backport

This will backport the following commits from `main` to `8.19`:
- [[ska][x-pack] relocate platform tests [7]
(#220803)](#220803)

<!--- Backport version: 10.0.0 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

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relocate platform tests [7] (#220803)\n\n## Summary\n\nPart of
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to\nx-pack/platform/test\n\nBefore:\n\n```\nx-pack/test/\n | -
encrypted_saved_objects_api_integration/\n | -
plugin_api_integration/\n```\n\nAfter: \n```\nx-pack/platform/test/\n |
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relocate platform tests [7] (#220803)\n\n## Summary\n\nPart of
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about moving tests from x-pack/test
to\nx-pack/platform/test\n\nBefore:\n\n```\nx-pack/test/\n | -
encrypted_saved_objects_api_integration/\n | -
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- encrypted_saved_objects_api_integration/\n | -
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BACKPORT-->

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>