Updates to FirestoreSessionHandler

[bshaffer]

There are still a few issues:

• session_gc returns false, even though the records get deleted as expected. I do not know why.
• The FirestoreTestCase function to delete $deletionQueue does not get registered. This is because the call do do this, which is in bootstrap.php, does not exist in system-bootstrap.php.
• Even when the deletion function is registered, the collections registered to be deleted in these tests are not deleted. I suspect it has something to do with them running in separate processes but I can't figure it out.

[jdpedrie]

The FirestoreTestCase function to delete $deletionQueue does not get registered. This is because the call do do this, which is in bootstrap.php, does not exist in system-bootstrap.php.

This is probably why so much junk piles up in the project! I'll look into that.

[bshaffer]

Remaining outstanding issues:

• session_gc mysteriously returns false
• $localDeletionQueue is not working

[codecov]

Codecov Report

Merging #2360 into master will increase coverage by 0.01%.
The diff coverage is 95.74%.

@@             Coverage Diff              @@
##             master    #2360      +/-   ##
============================================
+ Coverage     92.53%   92.55%   +0.01%     
- Complexity     4501     4503       +2     
============================================
  Files           312      312              
  Lines         13479    13497      +18     
============================================
+ Hits          12473    12492      +19     
+ Misses         1006     1005       -1

Impacted Files	Coverage Δ	Complexity Δ
Firestore/src/FirestoreClient.php	100% <ø> (ø)	21 <0> (ø)	⬇️
Firestore/src/FirestoreSessionHandler.php	97.56% <95.74%> (+0.19%)	22 <3> (+1)	⬆️
PubSub/src/Subscription.php	100% <0%> (ø)	40% <0%> (ø)	⬇️
Spanner/src/Connection/Grpc.php	94.35% <0%> (+0.11%)	95% <0%> (+1%)	⬆️
Spanner/src/Session/CacheSessionPool.php	97.84% <0%> (+0.35%)	88% <0%> (ø)	⬇️

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