T7699: Fix update of command/help fields in the op_mode_cache generator when paths are shared across files

[jestabro]

Change summary

An addendum to
#4636
this will be needed for correct behavior of the op-mode-runner on paths shared across files, for example:

Before:

vyos@vyos:~$ /usr/bin/vyos-op-run show interfaces 
Incomplete command: show interfaces

After the bug fix herein:

vyos@vyos:~$ /usr/bin/vyos-op-run show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface    IP Address          MAC                VRF        MTU  S/L    Description
-----------  ------------------  -----------------  -------  -----  -----  -------------
eth0         192.168.122.218/24  52:54:00:df:6e:8c  default   1500  u/u
eth1         -                   52:54:00:22:5a:62  default   1500  u/u
eth2         -                   52:54:00:c7:9e:eb  default   1500  u/u
eth3         -                   52:54:00:15:2b:df  default   1500  u/u
lo           127.0.0.1/8         00:00:00:00:00:00  default  65536  u/u
             ::1/128

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

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Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

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No issues in PR Title / Commit Title

[github-actions]

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• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed

[sever-sever]

Fixes op-mode Incomplete command.
I didn't check this code manually