Show `bot` label next to username when rendering autor link if the user is a bot (#24943)
If the user is a bot, we'll add a label next to the author link that
says `bot`. I didn't localize `bot` because passing `locale` into the
`autorlink` template would require changing all calls.
# Example
`yardenshoham` is a bot.
## Before
![image](https://github.com/go-gitea/gitea/assets/20454870/77390780-b763-4f0f-b358-bbccdbf17a5d)
## After
![image](https://github.com/go-gitea/gitea/assets/20454870/72af342f-ee76-4337-95ad-4ecaba853fed)
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Signed-off-by: Yarden Shoham <git@yardenshoham.com>