fix: combine copts and cxxopts for improved compiler argument handling

[mutalibmohammed]

This pull request updates how compiler flags are collected in the _get_compiler_args function. The change ensures that both copts and cxxopts attributes are included when gathering rule-specific flags.

• Now, both copts and cxxopts attributes are combined and used as rule flags in the _get_compiler_args function in lint/clang_tidy.bzl.

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Test

All tests were cache hits

5 tests (100.0%) were fully cached saving 2s.

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Test

example

8 test targets passed

Targets

//tools/format:format_test_HTML_Jinja_with_djlint [k8-fastbuild]5s
//tools/format:format_test_JavaScript_with_prettier [k8-fastbuild]14s
//tools/format:format_test_Markdown_with_prettier [k8-fastbuild]4s
//tools/format:format_test_Protocol_Buffer_with_buf [k8-fastbuild]597ms
//tools/format:format_test_Python_with_ruff [k8-fastbuild]763ms
//tools/format:format_test_SQL_with_prettier [k8-fastbuild]3s
//tools/format:format_test_Scala_with_scalafmt [k8-fastbuild]6s
//tools/format:format_test_Starlark_with_buildifier [k8-fastbuild]236ms

Total test execution time was 32s. 33 tests (80.5%) were fully cached saving 14s.

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Test (WORKSPACE) (Test)

example

8 test targets passed

Targets

//tools/format:format_test_HTML_Jinja_with_djlint [k8-fastbuild]1s
//tools/format:format_test_JavaScript_with_prettier [k8-fastbuild]5s
//tools/format:format_test_Markdown_with_prettier [k8-fastbuild]845ms
//tools/format:format_test_Protocol_Buffer_with_buf [k8-fastbuild]429ms
//tools/format:format_test_Python_with_ruff [k8-fastbuild]97ms
//tools/format:format_test_SQL_with_prettier [k8-fastbuild]1s
//tools/format:format_test_Scala_with_scalafmt [k8-fastbuild]3s
//tools/format:format_test_Starlark_with_buildifier [k8-fastbuild]143ms

Total test execution time was 12s. 13 tests (61.9%) were fully cached saving 8s.

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Lint [.]      Lint [example]

[mutalibmohammed]

@alexeagle Could I have a review for this please?