RDSC-3996 Add RDI 1.14.1 release notes. Update the Google Spanner documentation wrt new default option for using the service account

[ZdravkoDonev-redis]

1. RDI 1.14.1 release notes
2. Update Google Spanner documentation wrt new way of setting the GCP service account

[github-actions]

Staging links:
https://redis.io/docs/staging/RDSC-3996-rdi-1.14.1-release-notes/integrate/redis-data-integration/data-pipelines/prepare-dbs/spanner/
https://redis.io/docs/staging/RDSC-3996-rdi-1.14.1-release-notes/integrate/redis-data-integration/release-notes/rdi-1-14-1/

[Copilot]

Pull Request Overview

This PR adds release notes for RDI 1.14.1 and updates Google Spanner documentation to reflect the new default authentication method using Google Cloud Workload Identity.

• Creates release notes for RDI 1.14.1 highlighting new Workload Identity support and API validation fixes
• Updates Spanner documentation to clarify that Workload Identity is now the default authentication method
• Provides guidance on when to use service account credentials files as an alternative

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
content/integrate/redis-data-integration/release-notes/rdi-1-14-1.md	Adds new release notes file documenting features and fixes in RDI 1.14.1
content/integrate/redis-data-integration/data-pipelines/prepare-dbs/spanner.md	Updates authentication documentation to reflect Workload Identity as default method

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[andy-stark-redis]

Couple of minor suggestions (and I added the updated config.toml with the new version). Otherwise excellent - approved.

[andy-stark-redis]

Approved.