Always update tracked users when sharing keys

[Anderas]

Resolves https://github.com/matrix-org/element-web-rageshakes/issues/19974

There are some rare cases when room members are not correctly tracked in OlmMachine (investigating separately), which is typically triggered by m.room.membership events. To solve the consequence (rather than the root cause), ensure that we always update tracked users when sharing keys, even if this does not trigger keys query for the current event, but will do so before the next one. In other words if we do indeed have users that are not yet tracked, they will be unable to decrypt at most the current message, but should recieve the key for the next message.

[codecov]

Codecov Report

Patch coverage: 87.50% and project coverage change: +11.89 🎉

Comparison is base (a3c7edc) 25.56% compared to head (64b24a4) 37.46%.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1733       +/-   ##
============================================
+ Coverage    25.56%   37.46%   +11.89%     
============================================
  Files          612      612               
  Lines        96470    96510       +40     
  Branches     41592    41706      +114     
============================================
+ Hits         24664    36153    +11489     
+ Misses       70989    59280    -11709     
- Partials       817     1077      +260     

Impacted Files	Coverage Δ
...trixSDK/Crypto/CryptoMachine/MXCryptoMachine.swift	23.98% <0.00%> (+7.47%)	⬆️
MatrixSDK/Crypto/MXCryptoV2.swift	14.04% <0.00%> (ø)
...o/Algorithms/RoomEvent/MXRoomEventEncryption.swift	81.50% <85.71%> (+77.22%)	⬆️
...ms/RoomEvents/MXRoomEventEncryptionUnitTests.swift	96.31% <100.00%> (+96.31%)	⬆️
...cretStorage/JSONModels/MXSecretStorageKeyContent.m	91.48% <0.00%> (-8.52%)	⬇️
MatrixSDK/Lib/NSObject+sortedKeys.m	30.76% <0.00%> (-3.52%)	⬇️
...xSDK/Crypto/Algorithms/Megolm/MXMegolmEncryption.m	89.48% <0.00%> (-2.28%)	⬇️
...yncResponseFileStore/MXSyncResponseFileStore.swift	74.48% <0.00%> (-0.77%)	⬇️
...DK/Crypto/KeySharing/Secret/MXSecretShareManager.m	66.89% <0.00%> (ø)
MatrixSDK/MXRestClient.m	27.12% <0.00%> (+0.19%)	⬆️
... and 212 more

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[nimau]

LGTM