fix: to fix deleteRowRangeByPrefix for integer values above 127

[rahulKQL]

Fixes: #2509

This commit removes the intermediate conversion of rowKeyPrefix with UTF-8 String. Now we directly convert user-provided byte array to ByteString protobuf.

[codecov]

Codecov Report

Merging #2511 into master will decrease coverage by 0.00%.
The diff coverage is 60.00%.

@@             Coverage Diff              @@
##             master    #2511      +/-   ##
============================================
- Coverage     62.35%   62.34%   -0.01%     
- Complexity     1634     1636       +2     
============================================
  Files           200      200              
  Lines         10123    10129       +6     
  Branches       1035     1035              
============================================
+ Hits           6312     6315       +3     
- Misses         3348     3351       +3     
  Partials        463      463              

Impacted Files	Coverage Δ	Complexity Δ
...oud/bigtable/grpc/BigtableTableAdminGCJClient.java	83.33% <0.00%> (-7.58%)	20.00 <0.00> (ø)
...le/hbase/wrappers/veneer/AdminClientVeneerApi.java	100.00% <ø> (ø)	9.00 <0.00> (ø)
...che/hadoop/hbase/client/AbstractBigtableAdmin.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...bigtable/grpc/BigtableTableAdminClientWrapper.java	100.00% <100.00%> (ø)	23.00 <2.00> (+2.00)
.../hbase/wrappers/classic/AdminClientClassicApi.java	100.00% <100.00%> (ø)	9.00 <0.00> (ø)

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[igorbernstein2]

lgtm