Ensure test list is correct in CI

[jesseduffield]

Upon running go generate pkg/integration/tests/tests.go locally I get:

panic: expected test BasicAtRuntime to be defined in file basic_at_runtime.go. Perhaps you misspelt it? The name of the test should be the name of the file but converted from snake_case to PascalCase

goroutine 1 [running]:
main.appendDirTests({0x112f248, 0xc00009b5f0}, 0x110cb2c?)
	/Users/jesseduffieldduffield/repos/lazygit/pkg/integration/tests/test_list_generator.go:93 +0x4d4
main.generateCode()
	/Users/jesseduffieldduffield/repos/lazygit/pkg/integration/tests/test_list_generator.go:58 +0x205
main.main()
	/Users/jesseduffieldduffield/repos/lazygit/pkg/integration/tests/test_list_generator.go:23 +0x19
exit status 2
pkg/integration/tests/tests.go:1: running "go": exit status 1
Unexpected change to tests list. Run 'go generate pkg/integration/tests/tests.go' locally and commit the changes

To fix this I'm adding a step in CI to ensure the test list has been produced by the generator

• PR Description

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go run scripts/cheatsheet/main.go generate)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• Docs (specifically docs/Config.md) have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[github-actions]

Uffizzi Preview deployment-22252 was deleted.

[stefanhaller]

Ah, I did something similar in #2545. 😄

[jesseduffield]

great minds think alike. I've merged yours :)