[release/6.0-preview2] Turn off LKG calculation (dotnet#49075)

This change moves the performance infrastructure to use
the latest version of dotnet for building and running BDN.
This does not change what bits are tested.

Tighten bounds checks around TextEncoder logic

- Replaces unsafe code with safe code where possible
- Fixes some surrogate pairs being misinterpreted
- Fixes dotnet#45994
- Ref: MSRC 62749 (CVE-2021-26701)

[release/6.0-preview1] Produce a .version file for Microsoft.NETCore.…

…App in the runtime layout. (dotnet#47736)

* Produce a .version file for Microsoft.NETCore.App in the runtime layout.

* Update src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj

* Update src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj

Co-authored-by: Jeremy Koritzinsky <jekoritz@microsoft.com>
Co-authored-by: Jeremy Koritzinsky <jkoritzinsky@gmail.com>

Merge in 'release/5.0' changes

Merge in 'release/5.0' changes

Skip some PKCS9 tests on NetFx (dotnet#45213)

Skip some PKCS9 tests on NetFx (dotnet#45213)

[release/5.0] [browser][crypto] Remove restraining not supported attr…

…ibute Primitives (dotnet#43441)

Co-authored-by: Kenneth Pouncey <kjpou@pt.lu>

[release/5.0] [browser][crypto] Remove restraining not supported attr…

…ibute Primitives (dotnet#43441)

Co-authored-by: Kenneth Pouncey <kjpou@pt.lu>

Fix System.Net.Sockets telemetry (dotnet#42726)