Support Forgejo and Gitea avatars in git blame (#41813)

Part of #11043.

Codeberg is a public instance of Forgejo, as confirmed by the API
documentation at https://codeberg.org/api/swagger. Therefore, I renamed
the related component from codeberg to forgejo and added codeberg.org as
a public instance.

Furthermore, to optimize request speed for the commit API, I set
`stat=false&verification=false&files=false`.

<img width="1650" height="1268" alt="CleanShot 2025-11-03 at 19 57
06@2x"
src="https://github.com/user-attachments/assets/c1b4129e-f324-41c2-86dc-5e4f7403c046"
/>

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Regarding Gitea Support: 

Forgejo is a fork of Gitea, and their APIs are currently identical
(e.g., for getting avatars). However, to future-proof against potential
API divergence, I decided to treat them as separate entities. The
current gitea implementation is essentially a copy of the forgejo file
with the relevant type names and the public instance URL updated.

Release Notes:

- Added Support for Forgejo and Gitea avatars in git blame

crates/git_hosting_providers/src/providers.rs

@@ -1,6 +1,7 @@
 mod bitbucket;
 mod chromium;
-mod codeberg;
+mod forgejo;
+mod gitea;
 mod gitee;
 mod github;
 mod gitlab;
@@ -8,7 +9,8 @@ mod sourcehut;
 
 pub use bitbucket::*;
 pub use chromium::*;
-pub use codeberg::*;
+pub use forgejo::*;
+pub use gitea::*;
 pub use gitee::*;
 pub use github::*;
 pub use gitlab::*;