fix(ts_proto_library): require explicit srcs to copy

[alexeagle]

The hack of using a glob over the srcs causes a collision when there is more than one ts_proto_library in a bazel package. The resulting error doesn't give a clue what fix is required.

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Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): yes (note, ts_proto_library isn't a stable API yet)
• Suggested release notes appear below: yes

When ts_proto_library#copy_files is True, users must now repeat the .proto files whose outputs should be copied.

Test plan

• New test cases added

[CLAassistant]

All committers have signed the CLA.

[aspect-workflows[bot]]

Test

4 test targets passed

Targets

//docs:update_1_test [k8-fastbuild]                              35ms
//examples/proto_grpc:main [k8-fastbuild]                        202ms
//examples/proto_grpc:status_ts_proto.copy_0_test [k8-fastbuild] 49ms
//examples/proto_grpc:status_ts_proto.copy_1_test [k8-fastbuild] 43ms

Total test execution time was 329ms. 75 tests (94.9%) were fully cached saving 10s.

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