Strip only the first leading @ in repo name

[meteorcloudy]

This change is needed for glog to work with future version of Bazel when
canonical label literals is used in Bzlmod.

Context: https://docs.google.com/document/d/1N81qfCa8oskCk5LqTW-LNthy6EBrDot7bdUsjz6JFC4/edit#heading=h.5mcn15i0e1ch

[meteorcloudy]

/cc @Wyverald

[codecov-commenter]

Codecov Report

Merging #832 (d4a6de5) into master (086ce22) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #832      +/-   ##
==========================================
- Coverage   73.14%   73.13%   -0.02%     
==========================================
  Files          17       17              
  Lines        3281     2963     -318     
==========================================
- Hits         2400     2167     -233     
+ Misses        881      796      -85     

Impacted Files	Coverage Δ
src/stacktrace_unwind-inl.h	25.00% <0.00%> (-67.86%)	⬇️
src/demangle.cc	97.37% <0.00%> (-0.11%)	⬇️
src/signalhandler.cc	6.38% <0.00%> (-0.07%)	⬇️
src/raw_logging.cc	100.00% <0.00%> (ø)
src/logging.cc	75.35% <0.00%> (+0.80%)	⬆️
src/symbolize.cc	66.66% <0.00%> (+2.54%)	⬆️
src/vlog_is_on.cc	72.89% <0.00%> (+2.66%)	⬆️
src/utilities.cc	71.30% <0.00%> (+3.65%)	⬆️

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[drigz]

Thanks! When canonical label literals is used in Bzlmod, will native.repository_name() return a canonical label like "@@foo.1.0.2"? Will $(GENDIR)/external/ contain a repository including a single @ symbol like external/@foo.1.0.2?

[meteorcloudy]

When canonical label literals is used in Bzlmod, will native.repository_name() return a canonical label like "@@foo.1.0.2"? Will $(GENDIR)/external/ contain a repository including a single @ symbol like external/@foo.1.0.2?

Yes, that is correct. Related Bazel change is bazelbuild/bazel@de37930