Add "Changes Requested" sections to Trac reports

[desrosj]

Recently, a changes-requested keyword was introduced in Core Trac.

We should update the reports that are workflow oriented to include a section for this new workflow state:

• ​Report 2 (All tickets, workflow oriented)
• ​Report 6 (next major release, workflow oriented)
• ​Report 4 (next minor release, workflow oriented)
• ​Report 8 (Future releases, Workflow Oriented)

There's likely a few more.

Discussion related to adding the keyword: ​https://wordpress.slack.com/archives/C18723MQ8/p1650951302813149. Added in [r11798].

[desrosj]

There should also be a report added for this keyword, like there is for needs-patch needs-unit-tests, etc.