Bigtable: minor cleanups

[igorbernstein2]

No description provided.

[codecov]

Codecov Report

Merging #6142 into master will decrease coverage by 0.36%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #6142 +/- ##
============================================
- Coverage 47.38% 47.02% -0.37% + Complexity 27197 25732 -1465 
============================================
Files 2523 2523 Lines 274600 269325 -5275 Branches 31378 31185 -193 ============================================
- Hits 130124 126647 -3477 + Misses 134863 134000 -863 + Partials 9613 8678 -935

Impacted Files	Coverage Δ	Complexity Δ
...gle/cloud/bigtable/data/v2/BigtableDataClient.java	91.48% <ø> (+1.9%)	32 <0> (ø)	⬇️
...ud/bigtable/data/v2/stub/EnhancedBigtableStub.java	98.44% <ø> (-0.03%)	21 <0> (-1)
...ud/bigtable/admin/v2/BigtableTableAdminClient.java	80% <ø> (ø)	23 <0> (-4)	⬇️
...m/google/cloud/vision/v1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p4beta1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p3beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p2beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
.../java/com/google/cloud/speech/v1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...om/google/cloud/speech/v1p1beta1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...d/webrisk/v1beta1/WebRiskServiceV1Beta1Client.java	63.41% <0%> (-2.5%)	12% <0%> (-3%)
... and 640 more

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