Remove AV1530: Don't change a loop variable inside a for loop or a collection in a foreach loop (#363)

* Update AV1530 guideline

Split from #298.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review comments on AV1530: update title and add foreach collection example

Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>
Agent-Logs-Url: https://github.com/dennisdoomen/CSharpGuidelines/sessions/983488b6-53b6-4360-876c-4576219b2d4f

* Remove AV1530 rule file entirely

Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>
Agent-Logs-Url: https://github.com/dennisdoomen/CSharpGuidelines/sessions/0ce85de6-5278-491a-87c7-607ef017b67b

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Co-authored-by: Dennis Doomen <dennis.doomen@greenchoice.nl>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>

Author: 4 people