ISD-2288: Update tutorial

[alithethird]

Applicable spec: ISD-2288 (internal)

Overview

Updated the tutorial to standardize.

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 - 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)

[erinecon]

Thanks for your work on the tutorial!

[github-actions]

Test coverage for df4999f

Name                Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------
src/charm.py          557     35    190     34    91%   162, 204-207, 299->302, 414, 473->477, 627, 658, 664, 681-685, 715, 750-751, 811, 820, 924->937, 936, 938, 943-944, 1004, 1024, 1031, 1121, 1130, 1142, 1163, 1172, 1191, 1195, 1224, 1265, 1397, 1419, 1426->1428, 1471->exit, 1483, 1493, 1531
src/cos.py             20      0      0      0   100%
src/exceptions.py      16      1      2      1    89%   41
src/state.py           33      0      4      0   100%
src/types_.py          15      0      0      0   100%
---------------------------------------------------------------
TOTAL                 641     36    196     35    92%

Static code analysis report

Run started:2024-10-08 11:03:35.837674

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4647
  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):