Remove chaos variables from integration tests

[javierdelapuente]

Overview

Remove chaos-* variables from integration tests as they were removed from https://github.com/canonical/operator-workflows/pull/254.

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

• [ ] The charm style guide was applied
• [ ] The contributing guide was applied
• [ ] The changes are compliant with ISD054 - Manging 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[bot]]

Test coverage for 4c91fbc8ff41aa677640b2b498063574c1e9a7da

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        330     30     82     11    90%   177, 185-186, 350->355, 548-550, 555-556, 567-569, 574-575, 587-589, 594-595, 607-609, 634-636, 678->exit, 688->exit, 718-724, 750->exit, 764-765, 775->exit, 789
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               360     31     90     12    90%

Static code analysis report

Run started:2024-02-13 08:18:42.082996

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 1986
    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):