Document configurable ImportantFilesPatterns setting for release triggering

[Copilot]

The file patterns that determine whether a PR warrants a new release (^src/, ^README\.md$) are hardcoded in Get-PSModuleSettings with no user override. This documents a new Publish.Module.ImportantFilesPatterns setting to make them configurable.

Changes

• Configuration table: Added Publish.Module.ImportantFilesPatterns (String, comma-separated regex patterns)
• Important file change detection section: Restructured to show defaults as regex patterns and added "Customizing important file patterns" subsection with examples
• Default PSModule.yml example: Added ImportantFilesPatterns entry

Usage

# Override default patterns to also trigger releases on examples and changelog changes
Publish:
  Module:
    ImportantFilesPatterns: '^src/, ^README\.md$, ^examples/, ^CHANGELOG\.md$'

Default value: '^src/, ^README\.md$' (preserves current behavior).

Original prompt

/create-issue Make an issue where we add the option for important files that warrant a new release as parameters/inputs/config items in the settings file that the user can use to override the default behavior for what a release is. Today this is hardcoded into the action/workflow.

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