[ci_runner] Save last used startup options to apply to cleanup commands

[maggie-lou]

During remote runner cleanup, we run a bazel command to check that the bazel lock isn't still held by the server, which would indicate some corruption on the machine.

However, if a customer runs a bazel command with startup options, because we don't apply these same startup options during our cleanup command, the bazel server ends up getting killed and restarted.

To work around this before we can figure out a different solution (tracked here), save the startup options from the last executed bazel command so we can apply them during cleanup