fix: Firestore cleanup and fixes

[jdpedrie]

Fixed some minor mistakes and one potential bug where user-provided options were not passed to a write as expected.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@51e5281). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #1982   +/-   ##
=========================================
  Coverage          ?   92.56%           
  Complexity        ?     4371           
=========================================
  Files             ?      303           
  Lines             ?    12989           
  Branches          ?        0           
=========================================
  Hits              ?    12023           
  Misses            ?      966           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
Firestore/src/QuerySnapshot.php	100% <ø> (ø)	5 <0> (?)
Firestore/src/Query.php	99.19% <ø> (ø)	85 <0> (?)
Firestore/src/Connection/Grpc.php	100% <ø> (ø)	12 <0> (?)
Firestore/src/SnapshotTrait.php	100% <ø> (ø)	26 <0> (?)
Firestore/src/PathTrait.php	100% <100%> (ø)	31 <0> (?)
Firestore/src/WriteBatch.php	100% <100%> (ø)	128 <0> (?)

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