Revise project management documentation for process updates

[allthedoll]

Description

Refactor project management documentation for clarity and structure. Update roles, responsibilities, and meeting cadences to enhance understanding of workflows.

Replaces #4473 but doesn't change the page title.

Related Issue(s)

n/a

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

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