fix: remove unused gflag variable (#1775)

[jmoldyvan]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

close #1775 to remove instances of (enable_timeseries_table)

• What is the current behavior? (You can also link to an open issue here)
  Just some code delete

• What is the new behavior (if this is a feature change)?
  This doesn't actually change anything about the behavior

[github-actions]

SDK Test Report

  73 files    73 suites   6m 18s ⏱️
174 tests 171 ✔️ 3 💤 0 ❌
215 runs  212 ✔️ 3 💤 0 ❌

Results for commit 6345192.

[github-actions]

Linux Test Report

       57 files       186 suites   1h 6m 19s ⏱️
  8 468 tests   8 460 ✔️ 8 💤 0 ❌
12 419 runs  12 411 ✔️ 8 💤 0 ❌

Results for commit 6345192.

[codecov]

Codecov Report

Merging #1777 (6345192) into main (361f44d) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1777      +/-   ##
============================================
- Coverage     73.64%   73.63%   -0.02%     
  Complexity      347      347              
============================================
  Files           614      614              
  Lines        120131   120131              
  Branches       1015     1015              
============================================
- Hits          88475    88461      -14     
- Misses        31447    31461      +14     
  Partials        209      209              

Impacted Files	Coverage Δ
src/nameserver/name_server_impl.cc	42.15% <ø> (-0.16%)	⬇️
src/nameserver/name_server_test.cc	92.29% <ø> (ø)
src/nameserver/standalone_test.cc	100.00% <ø> (ø)
src/sdk/db_sdk.cc	61.67% <0.00%> (-1.37%)	⬇️
src/catalog/client_manager.cc	42.20% <0.00%> (-0.29%)	⬇️
src/client/ns_client.cc	44.62% <0.00%> (-0.15%)	⬇️
src/storage/mem_table.cc	89.13% <0.00%> (-0.14%)	⬇️
src/tablet/tablet_impl.cc	58.81% <0.00%> (-0.10%)	⬇️
src/client/tablet_client.cc	48.29% <0.00%> (ø)
... and 3 more

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