[Bug]: clang-tidy aspect fails on CcInfo rules without srcs

[cramertj]

What happened?

rules_lint/lint/clang_tidy.bzl

Lines 309 to 312 in 559ed12

	if not CcInfo in target:
	return []
	files_to_lint = _filter_srcs(ctx.rule)

assumes that all CcInfo rules have a srcs label list:

rules_lint/lint/clang_tidy.bzl

Lines 145 to 149 in 559ed12

	def _filter_srcs(rule):
	if "lint-genfiles" in rule.attr.tags:
	return rule.files.srcs
	else:
	return [s for s in rule.files.srcs if _is_source(s)]

In my project (Pigweed) we have custom pwpb_proto_library rule which provides CcInfo but does not have a srcs list:

https://github.com/google/pigweed/blob/8bd77aba07ab3dce5220b23994cd3ecfbcefda10/pw_protobuf_compiler/pw_proto_library.bzl#L536-L549

This leads to the following error when running bazelisk lint //pw_rpc:echo_cc.pwpb:

➜  pigweed git:(af6a29e26) ✗ bazelisk lint //pw_rpc:echo_cc.pwpb
2024/10/08 14:55:38 Using unreleased version at commit 1ff5af18d045e8f30a2a0367470db4e8225a785c
2024/10/08 14:55:38 Using unreleased version at commit 1ff5af18d045e8f30a2a0367470db4e8225a785c
ERROR: /usr/local/google/home/cramertj/src/pigweed/pw_rpc/BUILD.bazel:486:17: in //tools/lint:linters.bzl%clang_tidy aspect on _pwpb_proto_library rule //pw_rpc:echo_cc.pwpb:
Traceback (most recent call last):
	File "/tmp/bazel_output_user_root/02fd49830a521506a99f19a1e23f8759/external/aspect_rules_lint+/lint/clang_tidy.bzl", line 312, column 33, in _clang_tidy_aspect_impl
		files_to_lint = _filter_srcs(ctx.rule)
	File "/tmp/bazel_output_user_root/02fd49830a521506a99f19a1e23f8759/external/aspect_rules_lint+/lint/clang_tidy.bzl", line 149, column 38, in _filter_srcs
		return [s for s in rule.files.srcs if _is_source(s)]
Error: No attribute 'srcs' in files. Make sure there is a label or label_list type attribute with this name
Available attributes: _action_listener, _config_dependencies, aspect_hints, compatible_with, deps, exec_compatible_with, package_metadata, protos, restricted_to, target_compatible_with, toolchains
Target //pw_rpc:echo_cc.pwpb failed to build
ERROR: Analysis of aspects '[//tools/lint:linters.bzl%clang_tidy, //tools/lint:linters.bzl%ruff] with parameters {} on //pw_rpc:echo_cc.pwpb' failed; build aborted: Analysis of target '//pw_rpc:echo_cc.pwpb' failed
INFO: Elapsed time: 0.236s, Critical Path: 0.01s
INFO: 1 process: 1 internal.
ERROR: Build did NOT complete successfully

Version

Output of bazel --version:
aspect 2024.40.2-a7ed65a (with local changes)

Version of the Aspect rules, or other relevant rules from your
WORKSPACE or MODULE.bazel file:
bazel_dep(name = "aspect_rules_lint", version = "1.0.2")

How to reproduce

Create a `rule` which provides `CcInfo` but does not have a `srcs` label field, then run the `clang-tidy` linter on that rule.

Any other information?

No response