chore: rename fixtures for clarity

[yanksyoon]

Applicable spec: N/A

Overview

Follow up to the comment on #58 PR, #58 (review) to rename the fixtures returning the app related to abc charm to abc_related_app from app_abc_related for clarity.
All other fixtures in this codebase use fixture naming convention: abc_related_app to denote Jenkins charm, abc_related to denote abc charm related to Jenkins charm.

Rationale

To follow conventions in this codebase.

Juju Events Changes

None.

Module Changes

None.

Library Changes

None.

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 e09365c

Name               Stmts   Miss Branch BrPart  Cover   Missing
--------------------------------------------------------------
src/agent.py          91      0     12      0   100%
src/charm.py         107      0     18      0   100%
src/cos.py            21      0      0      0   100%
src/ingress.py         9      0      0      0   100%
src/jenkins.py       355      0     68      0   100%
src/state.py         103      0     22      0   100%
src/status.py          6      0      2      0   100%
src/timerange.py      31      0      6      0   100%
--------------------------------------------------------------
TOTAL                723      0    128      0   100%

Static code analysis report

Run started:2023-11-15 10:05:43.837923

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 5584
  Total lines skipped (#nosec): 6
  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):