Merge upstream Matrix Rust SDK 26.05.21 compatible ref

[ehsunahmadi]

• I've documented the public API changes in the appropriate changelog files
  (see Writing changelog entries).
• This PR was made with the help of AI.

Signed-off-by:

[codecov]

Codecov Report

❌ Patch coverage is 90.57454% with 251 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.99%. Comparing base (4e8ceaa) to head (2378b7e).
⚠️ Report is 123 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/matrix-sdk-base/src/store/traits.rs	69.64%	94 Missing and 1 partial ⚠️
crates/matrix-sdk-base/src/client.rs	72.72%	0 Missing and 15 partials ⚠️
crates/matrix-sdk-sqlite/src/media_store.rs	92.47%	12 Missing and 2 partials ⚠️
crates/matrix-sdk-sqlite/src/event_cache_store.rs	91.77%	12 Missing and 1 partial ⚠️
crates/matrix-sdk-base/src/room/room_info.rs	96.27%	3 Missing and 8 partials ⚠️
crates/matrix-sdk-base/src/room/mod.rs	87.50%	5 Missing and 3 partials ⚠️
crates/matrix-sdk-crypto/src/store/memorystore.rs	0.00%	8 Missing ⚠️
crates/matrix-sdk-sqlite/src/connection.rs	84.31%	6 Missing and 2 partials ⚠️
crates/matrix-sdk-base/src/sliding_sync.rs	98.23%	5 Missing and 1 partial ⚠️
crates/matrix-sdk-sqlite/src/crypto_store.rs	95.52%	1 Missing and 5 partials ⚠️
... and 25 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6601      +/-   ##
==========================================
+ Coverage   89.94%   89.99%   +0.04%     
==========================================
  Files         381      382       +1     
  Lines      105871   107941    +2070     
  Branches   105871   107941    +2070     
==========================================
+ Hits        95228    97138    +1910     
- Misses       6999     7141     +142     
- Partials     3644     3662      +18     

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