[ADD] *: changelog entries I forgot

Can't hurt to *have* them.

forwardport/changelog/2023-08/outstanding.md

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+IMP: outstandings page
+
+- increased time-before-outstanding from 3 to 7 days, as 3~4 days is common in
+  normal operations, especially when merging from very low branches were
+  forward-porting may take a while
+- improved performances by optimising fetching & filtering
+- added counts to the main listing for clarity (instead of hiding them in a
+  popover)
+- added the *original authors* for the outstanding forward ports
+- added ability to filter by team, if such are configured

runbot_merge/changelog/2023-08/opts.md

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+IMP: optimize home page
+
+An unnecessary deopt and a few opportunities were found and fixed in the home
+page / main dashboard, a few improvements have been implemented which should
+significantly lower the number of SQL queries and the time needed to generate
+the page.

runbot_merge/changelog/2023-08/staging-reverse-index.md

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+ADD: stagings reverse index (from commits)
+
+Finding out the commits from a staging is not great but it's easy enough, the
+reverse was difficult and very inefficient. Splat out the "heads" JSON field
+into two join tables, and provide both ORM methods and a JSON endpoint to
+lookup stagings based on their commits.

runbot_merge/changelog/2023-08/stagings-to-prs.md

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+IMP: added quick jump from staging to PR in the backend
+
+In the backend, going through the batches to reach a PR is really not
+convenient, directly displaying both github URL and frontend URL for each PR
+makes jumping around much easier.