feat: consider WebAuthn & SSH for instance signing (#7693)

- Currently the options `pubkey` and `twofa` only consider TOTP and GPG keys respectively. Adjust the code to also consider WebAuthn credentials and SSH keys.
- While adding the new unified functions I noticed that certain places also benefited from using these unified functions and took the liberty (where it was either a trivial translation or it was covered under testing) to use the new unified functions.
- Resolves forgejo/forgejo#7658
- Adds unit and integration tests.

Documentation PR: https://codeberg.org/forgejo/docs/pulls/1166

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7693
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

routers/web/user/setting/security/security.go

@@ -55,7 +55,7 @@ func DeleteAccountLink(ctx *context.Context) {
 }
 
 func loadSecurityData(ctx *context.Context) {
-	enrolled, err := auth_model.HasTwoFactorByUID(ctx, ctx.Doer.ID)
+	enrolled, err := auth_model.HasTOTPByUID(ctx, ctx.Doer.ID)
 	if err != nil {
 		ctx.ServerError("SettingsTwoFactor", err)
 		return