gitalyClientRetries: Make value configurable in the Helm Chart
## Expose new configurable field in Helm chart
### Description
Following the completion of [issue #584430](https://gitlab.com/gitlab-org/gitlab/-/issues/584430) which makes the Gitaly client retries configurable, we need to expose this newly configurable field in the Helm chart to allow users to configure it during deployment.
### Acceptance Criteria
- [ ] Add the new configurable field to the appropriate Helm chart values
- [ ] Update chart templates to use the new configuration value
- [ ] Ensure proper default values are set
- [ ] Update chart documentation to reflect the new configuration option
### Dependencies
- Blocked by: https://gitlab.com/gitlab-org/gitlab/-/issues/584430
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