Remove legacy slave integration

[arturo-seijas]

Applicable spec: N/A

Overview

Remove legacy slave integration

Rationale

The legacy slave integration is not supported anymore by any other charm

Juju Events Changes

Removed events corresponding to the relation

Module Changes

Changes all across the charm

Library Changes

N/A

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test coverage for 88cc078

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/agent.py         61      0     12      0   100%
src/charm.py         58      0     10      0   100%
src/metadata.py       9      0      0      0   100%
src/pebble.py        24      0      0      0   100%
src/server.py        51      0     12      0   100%
src/state.py         67      0     12      0   100%
-------------------------------------------------------------
TOTAL               270      0     46      0   100%

Static code analysis report

Run started:2024-01-30 12:06:20.974035

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1648
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):