Tagging for 6.0.0-preview3 release.

Merge branch 'main' into dev/cheena/pull-main

Doc | Release notes v6.0 preview1 (dotnet#2813)

[5.1] Eng | Add strong name validation to package validator (dotnet#2802

) (dotnet#2804)

[5.2.2] | Fix decrypt failure to drain data (dotnet#2618) (dotnet#2817)

Eng | Add strong name validation to package validator (dotnet#2802) (d…

…otnet#2807)

Merged PR 4867: eng | Update patch version for release MDS 3.1.7

#### AI description  (iteration 1)
#### PR Classification
Version update for release.

#### PR Summary
This pull request updates the patch version for the MDS 3.1.7 release.
- `eng/pipelines/libraries/mds-variables.yml`: Incremented the patch version from 6 to 7.

Related work items: #29493

Fix | Enhance certificate validation (dotnet#2487)

Fix | ExecuteReaderAsync API xml and ref files (dotnet#2373)

AKV Release notes (dotnet#2335)