Sam 43da88db6c
PERF: avoid following links in topic RSS feeds (#16145)
Topic RSS feeds contain many non canonical links such as:

- https://site.com/t/a-b-c/111/1
- https://site.com/t/a-b-c/111/2
- https://site.com/t/a-b-c/111/3
- https://site.com/t/a-b-c/111/4
- https://site.com/t/a-b-c/111/5
- https://site.com/t/a-b-c/111/6

Previously we were not indexing RSS feeds yet still following these
links.


This change means we totally ignore links in the RSS feeds which
avoids expensive work scanning them just to find we should not
include them.
2022-03-09 18:25:20 +11:00
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