CP-49526: Resolve non-CDN design comments

1 Change the max total bundle files size limit to 1G.
2 Change HTTP error code for `bundle_repo_not_enabled` to 400.

Signed-off-by: Bengang Yuan <bengang.yuan@cloud.com>

ocaml/xapi/xapi_globs.ml

@@ -957,8 +957,8 @@ let ignore_vtpm_unimplemented = ref false
 
 let evacuation_batch_size = ref 10
 
-(* Max size limit of bundle file: 500 MB*)
-let bundle_max_size_limit = ref (Int64.of_int (500 * 1024 * 1024))
+(* Max size limit of bundle file: 1 GB*)
+let bundle_max_size_limit = ref (Int64.of_int (1024 * 1024 * 1024))
 
 type xapi_globs_spec =
  | Float of float ref

ocaml/xapi/xapi_pool.ml

@@ -3806,5 +3806,8 @@ let put_bundle_handler (req : Request.t) s _ =
  Http_svr.headers s (Http.http_400_badrequest ())
  )
  | `remote ->
- raise Api_errors.(Server_error (bundle_repo_not_enabled, []))
+ error "%s: Bundle repo is not enabled" __FUNCTION__ ;
+ TaskHelper.failed ~__context
+ Api_errors.(Server_error (bundle_repo_not_enabled, [])) ;
+ Http_svr.headers s (Http.http_400_badrequest ())
  )