CI: run all C/C++ tests in C/C++ matrix

[chrisnovakovic]

The union of plz test -i test,cc and plz test -i test,go isn't the set of tests in the repo: it excludes the //test:static_test e2e test and the //test/strip:strip_test and //test/binary:cc_binary_test gentests. Consider the set of C/C++ tests to be the inversion of the set of tests triggered by plz test -i test,go (in other words, plz test -e test,go) so that these three tests are correctly considered to be C/C++ tests.

[chrisnovakovic]

This is now doing the right thing.

C/C++ tests:

Run ./pleasew test -e test,go --keep_going --log_file plz-out/log/test.log
Downloading Please 17.19.1 to /home/runner/.please/17.19.1...
Should be good to go now, running plz...
//test:cc_deps_test 2 tests run in 3ms; 2 passed
//test:cc_multisrc_test 2 tests run in 4ms; 2 passed
//test:cc_multisrc_test_2 2 tests run in 6ms; 2 passed
//test:static_test 1 test run in 2.98s; 1 passed
//test/binary:cc_binary_test 1 test run in 4ms; 1 passed
//test/deps:deps_test 1 test run in 3ms; 1 passed
//test/labels:lib_test 1 test run in 5ms; 1 passed
//test/modules:interdependent_modules_test 2 tests run in 4ms; 2 passed
//test/so:so_test 1 test run in 3ms; 1 passed
//test/strip:strip_test 1 test run in 296ms; 1 passed
11 test targets and 14 tests run; 14 passed.
Total time: 18.95s real, 3.31s compute.

Go (please_cc) tests:

Run ./pleasew test -i test,go --keep_going --log_file plz-out/log/test.log
Downloading Please 17.19.1 to /home/runner/.please/17.19.1...
Should be good to go now, running plz...
//tools/please_cc/cctool:cctool_test 644 tests run in 347ms; 644 passed
//tools/please_cc/expr:expr_test 252 tests run in 15ms; 252 passed
2 test targets and 896 tests run; 896 passed.
Total time: 33.51s real, 360ms compute.