Improve S3 migrations

[javierdelapuente]

Overview

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 6b5fd0bc18b0f0c678bbb6222d7181f8b8c9f72f

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        321     27     78     12    90%   186, 194-195, 207, 335->343, 376->381, 393, 575-577, 582-583, 595-597, 602-603, 615-617, 640-642, 688->exit, 698->exit, 728-734, 760->exit, 774-775, 785->exit, 799
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               351     28     86     13    91%

Static code analysis report

Run started:2024-05-06 10:03:26.770010

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 2051
    Total lines skipped (#nosec): 3
    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):