This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/5f7bb900-b4ec-41d2-acea-c5c2f5dfb4fa/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@901ddd4
Source-Link: googleapis/synthtool@f96d3b4

The new features allow user to check and tune [IAM policy](https://cloud.google.com/iam/docs/reference/rest/v1/Policy) for the backup level:

- `getIamPolicy` - allows a user obtain the current resource IAM policy.
- `setIamPolicy` - allows a user to set resource level IAM policy.
- `testIamPermissions` - allows a user to pass a list of [`permissions`](https://cloud.google.com/bigtable/docs/access-control#permissions) and get back a sub-list of granted permissions.

- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/6dcea365-b918-4c52-b1db-d7a62c956000/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@89c849b
Source-Link: googleapis/synthtool@a783321
Source-Link: googleapis/synthtool@b7413d3
Source-Link: googleapis/synthtool@5f6ef0e

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/9f0ce149-63bd-4aad-917d-44f82c8912a6/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@ba9918c

* fix: do not modify options object, use defaultScopes

Regenerated the library using gapic-generator-typescript v1.2.1.

* fix(deps): require google-gax ^2.9.2

* fix: generated pack test

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>