pantsbuild / pants / 18857275271

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test_shell_command: use correct default cache scope for a test's environment (#22804)

Fix `test_shell_command` to use the correct default process cache scope
for the environment in which the test is running. The existing code was
always using the "success" cache scope.

For workspace environments (i.e., `experimental_workspace_environment`)
however, the default is "session" scope and not the "success" scope used
for other environments. "Session" scope is used for in-workspace
execution because Pants does not know how underlying tools cache and
invalidate their results. Thus always running a tool each session makes
sure Pants does not inadvertently cache a result which the tool would
have recomputed.

Also add `cache_scope` as a field on `test_shell_command` so users may
override the caches scope as needed.

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