Use AnyCharm for loki integration test

[swetha1654]

Overview

Testing if logging endpoint is configured by doing the following -

• Deploying loki using anyCharm to improve integration test speed.
• Integrating with maubot
• Checking if the maubot pebble plan has the logging endpoint configured

Changed the existing test cases to use the newly added fixtures

Link to JIRA - ISD-2574

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]

license-eye has checked 55 files.

Valid	Invalid	Ignored	Fixed
13	1	41	0

Click to see the invalid file list

• tests/integration/helpers.py

Use this command to fix any missing license headers

```bash

docker run -it --rm -v $(pwd):/github/workspace apache/skywalking-eyes header fix

</details>

[swetha1654]

yes i am

[github-actions]

Test coverage for f98c41a

Name            Stmts   Miss Branch BrPart  Cover   Missing
-----------------------------------------------------------
src/charm.py      184     12     28      7    91%   164-166, 189, 193, 197, 215, 219, 244, 316, 321, 346
src/maubot.py      31      4      2      1    85%   53, 84-86
-----------------------------------------------------------
TOTAL             215     16     30      8    90%

Static code analysis report

Run started:2024-11-29 04:14:43.339844

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1032
  Total lines skipped (#nosec): 0
  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):