[dotnet] Perf API `IBuffer.TryGetReadOnlySpan`

* Use substring search on `ReadOnlySpan<char>` if possible
* Use operations on `ReadOnlySpan<char>` in some `BufferUtil` methods


(cherry picked from commit cf9359a7c4969fe15ef5fb700b03a841fa071e39)

GitOrigin-RevId: b6e0587dc3a0368c0c3d08355c36a6faced76b03

[dotnet] Perf API `IBuffer.TryGetReadOnlySpan`

* Use substring search on `ReadOnlySpan<char>` if possible
* Use operations on `ReadOnlySpan<char>` in some `BufferUtil` methods


(cherry picked from commit cf9359a7c4969fe15ef5fb700b03a841fa071e39)

GitOrigin-RevId: b6e0587dc3a0368c0c3d08355c36a6faced76b03

[rider] RIDER-115712 Explicitly added reference types in Unity

(cherry picked from commit d7862d31401339fc03bfb4f9aed054ea0d7733d6)

IJ-MR-156024

GitOrigin-RevId: 21d2ff1f8e81fc794f2431b8ebfe2b992c07450e

[rider] RIDER-115712 Explicitly added reference types in Unity

(cherry picked from commit d7862d31401339fc03bfb4f9aed054ea0d7733d6)

IJ-MR-156024

GitOrigin-RevId: 21d2ff1f8e81fc794f2431b8ebfe2b992c07450e

[rider][unity] fix RIDER-123126 Add What's New Action to enable Profi…

…ler Integration

GitOrigin-RevId: b6023af21b7302c67875f4eb48ba9d38a3fd0827

[rider][unity] fix RIDER-123126 Add What's New Action to enable Profi…

…ler Integration

GitOrigin-RevId: b6023af21b7302c67875f4eb48ba9d38a3fd0827

[rider][unity] Add external link to unity profiler integration doc (F…

…IX RIDER-122588)

GitOrigin-RevId: 6d319e134cac68fdbb6606c62e7de984c8f18009

[rider][backend][statistics] Add Unity profiler statistics

GitOrigin-RevId: 45fa562f46037b2930a64a7ddb71e076e4ce5d36

[rider][backend][statistics] Add Unity profiler statistics

GitOrigin-RevId: 45fa562f46037b2930a64a7ddb71e076e4ce5d36

Revert "fix RIDER-111963 Rewrite UnityToolWindowFactory"

This reverts commit 0b3cfd0a3dc9190e646bfd304b7e625fd92baeed.


(cherry picked from commit 1a30abfeab340684dcba07144dabb6b2373604c9)

IJ-MR-153826

GitOrigin-RevId: 1d99487ddf2ac547c9beee29176482073e6e7315