[8.0.0] Extract methods to acquire and release a filesystem lock. #24223
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They are currently only used to acquire a lock on the output base, but a future change will use them to lock the install base as well.
Human-readable output is also amended to refer to the "output base lock" instead of the "client lock", as the latter term becomes ambiguous once multiple locks exist.
Progress on #2109.
PiperOrigin-RevId: 693354279
Change-Id: I2b39e6f5ddb83bbc2be15a31d7de9655358776c5