MDS v6.1.0 Preview 2

Merge | Port SqlDataSourceConverter, widen test coverage (#3309)

* Port type converter for DataSource, FailoverPartner

Also add test coverage for this type converter (and for the netfx-only NetworkLibraryConverter.)

* Tests: pass DescriptorContext to InitialCatalogConverter.GetStandardValuesSupported

Port localizations for the new SNI_ERROR_10 code from PR #3284 (#3308)

Added localizations for the new SNI_ERROR_10 code from PR #3284.

MDS Release v5.1.7

[6.0] Port localization string changes (#3296)

Port #3126 to release/6.0 (#3127)

* Fix down-level SSL/TLS version warnings (#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 <55035479+edwardneal@users.noreply.github.com>

Tagging for 6.0.0-preview3 release.

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

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

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

…2804)