Remove --instrumentation_filter from .bazelrc to fix sub-workspace CI

The .bazelrc is inherited by sub-workspace CI tasks (cc_common_link,
bzlmod_repo_mapping, sys, pyo3) causing build/test failures. The flag
is already passed via coverage_flags in presubmit.yml for coverage tasks.

Co-authored-by: Isaac

Author: Tamas Vajk

.bazelrc

@@ -20,12 +20,6 @@ coverage --combined_report=lcov
 coverage --experimental_fetch_all_coverage_outputs
 coverage --experimental_split_coverage_postprocessing
 
-# Instrument all workspace targets for coverage. Without this, the default
-# --instrumentation_filter may not match workspace targets, resulting in
-# empty coverage reports. Projects should adjust this to exclude vendored
-# dependencies, e.g.: coverage --instrumentation_filter=^//,-^//third_party
-coverage --instrumentation_filter=^//
-
 # Required for some of the tests
 # https://bazel.build/reference/command-line-reference#flag--experimental_cc_shared_library
 common --experimental_cc_shared_library