Remove ANSI escape sequences from logfile

[JimMadge]

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:vertical_traffic_light: Depends on

:arrow_heading_up: Summary

Adds a routine to strip ANSI escape sequences from log messages when written to file.

:closed_umbrella: Related issues

Fixes #2222

:microscope: Tests

Tested locally for example,

before,

2024-10-08 15:01:49,040 - INFO -                     vmName                 : output<string>

after,

2024-10-08 16:03:28,875 - INFO -                 vmName            : "shm-daimyo-sre-hojo-vm-workspace-01"

[github-actions[bot]]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
data_safe_haven/logging
plain_file_handler.py
Project Total

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