[BEAM-14290] Address staticcheck warnings in the reflectx package

[jrmccluskey]

Adds a lint:file-ignore to the calls.tmpl file and has it added to a regenerated calls.go file, cleans up unnecessary blank identifiers and variable declarations, and shortens make() calls.

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Codecov Report

Merging #17373 (213a6b4) into master (73c683f) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #17373      +/-   ##
==========================================
- Coverage   73.76%   73.76%   -0.01%     
==========================================
  Files         686      686              
  Lines       90117    90116       -1     
==========================================
- Hits        66477    66476       -1     
  Misses      22470    22470              
  Partials     1170     1170              

Flag	Coverage Δ
go	49.34% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
sdks/go/pkg/beam/core/util/reflectx/calls.go	0.00% <ø> (ø)
sdks/go/pkg/beam/core/util/reflectx/call.go	89.74% <100.00%> (ø)
sdks/go/pkg/beam/core/util/reflectx/types.go	94.59% <100.00%> (-0.15%)	⬇️

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[damccorm]

LGTM

[github-actions]

R: @lostluck for final approval

[lostluck]

LGTM