build(java): switch to release-please for release tagging

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[codecov]

Codecov Report

Merging #795 (e5f3ca9) into master (d293585) will increase coverage by 0.32%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #795      +/-   ##
============================================
+ Coverage     83.13%   83.46%   +0.32%     
  Complexity     1314     1314              
============================================
  Files           114      114              
  Lines          7803     7806       +3     
  Branches        418      446      +28     
============================================
+ Hits           6487     6515      +28     
- Misses         1033     1036       +3     
+ Partials        283      255      -28     

Impacted Files	Coverage Δ	Complexity Δ
.../bigtable/admin/v2/models/RestoredTableResult.java	66.66% <0.00%> (-8.34%)	2.00% <0.00%> (ø%)
...om/google/cloud/bigtable/emulator/v2/Emulator.java	59.83% <0.00%> (ø)	14.00% <0.00%> (ø%)
...ud/bigtable/data/v2/stub/EnhancedBigtableStub.java	97.13% <0.00%> (+0.01%)	32.00% <0.00%> (ø%)
.../bigtable/admin/v2/models/RestoreTableRequest.java	82.85% <0.00%> (+0.50%)	10.00% <0.00%> (ø%)
...able/admin/v2/BaseBigtableInstanceAdminClient.java	80.43% <0.00%> (+3.91%)	95.00% <0.00%> (ø%)
...igtable/admin/v2/BaseBigtableTableAdminClient.java	82.78% <0.00%> (+5.04%)	123.00% <0.00%> (ø%)

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