Port dotnet#3126 to release/6.0 (dotnet#3127)

* Fix down-level SSL/TLS version warnings (dotnet#3126)

* Added test for downlevel connectivity warning

* Correctly test bit flags for legacy SSL protocol warning

* Corrected warning disablement/restore.

(cherry picked from commit 198b906)

* Test by rolling back changes to connection test matrix

---------

Co-authored-by: Edward Neal <[email protected]>

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)