Enable ISC rule + autoformat

[artem-shelkovnikov]

Enabling an "ISC" linter rule.

ISC rule is "Implicit String Concat": https://docs.astral.sh/ruff/rules/#flake8-implicit-str-concat-isc

Subrules are:

• ISC001 | implicitly concatenated string literals on one line
• ISC002 | implicitly concatenated string literals over continuation line
• ISC003 | explicitly concatenated string should be implicitly concatenated

This ruleset is there to make sure that string concatenation is expressed properly.

Example from documentation:

$ cat example.py
s = ('111111111111111111111'
     '222222222222222222222')
$ black example.py
reformatted example.py
All done! ✨ 🍰 ✨
1 file reformatted.
$ cat example.py
s = "111111111111111111111" "222222222222222222222"
$ flake8 example.py
example.py:1:28: ISC001 implicitly concatenated string literals on one line
$ edit example.py # Remove the " " and save
$ cat example.py
s = "111111111111111111111222222222222222222222"
$ black example.py
All done! ✨ 🍰 ✨
1 file left unchanged.
$ flake8 example.py
$

Violations:

tests/sources/fixtures/postgresql/fixture.py:62:17: ISC003 Explicitly concatenated string should be implicitly concatenated

[navarone-feekery]

Approved but there seems to be a merge conflict, let me know if it will need re-approval

[github-actions]

💔 Failed to create backport PR(s)

The backport operation could not be completed due to the following error:
There are no branches to backport to. Aborting.

The backport PRs will be merged automatically after passing CI.

To backport manually run:
backport --pr 1856 --autoMerge --autoMergeMethod squash