Remove git_repository field from GitConfig

It is no longer needed after a recent refactoring.

src/bootstrap/src/core/build_steps/suggest.rs

@@ -13,7 +13,6 @@ pub fn suggest(builder: &Builder<'_>, run: bool) {
     let git_config = builder.config.git_config();
     let suggestions = builder
         .tool_cmd(Tool::SuggestTests)
-        .env("SUGGEST_TESTS_GIT_REPOSITORY", git_config.git_repository)
         .env("SUGGEST_TESTS_NIGHTLY_BRANCH", git_config.nightly_branch)
         .env("SUGGEST_TESTS_MERGE_COMMIT_EMAIL", git_config.git_merge_commit_email)
         .run_capture_stdout(builder)

src/bootstrap/src/core/build_steps/test.rs

@@ -2064,7 +2064,6 @@ fn run(self, builder: &Builder<'_>) {
         }
 
         let git_config = builder.config.git_config();
-        cmd.arg("--git-repository").arg(git_config.git_repository);
         cmd.arg("--nightly-branch").arg(git_config.nightly_branch);
         cmd.arg("--git-merge-commit-email").arg(git_config.git_merge_commit_email);
         cmd.force_coloring_in_ci();

src/bootstrap/src/core/config/config.rs

@@ -2963,7 +2963,6 @@ pub fn default_codegen_backend(&self, target: TargetSelection) -> Option<String>
 
     pub fn git_config(&self) -> GitConfig<'_> {
         GitConfig {
-            git_repository: &self.stage0_metadata.config.git_repository,
             nightly_branch: &self.stage0_metadata.config.nightly_branch,
             git_merge_commit_email: &self.stage0_metadata.config.git_merge_commit_email,
         }

src/bootstrap/src/utils/tests/git.rs

@@ -135,7 +135,6 @@ fn git_cmd(&self) -> Command {
 
     fn git_config(&self) -> GitConfig<'_> {
         GitConfig {
-            git_repository: &self.git_repo,
             nightly_branch: &self.nightly_branch,
             git_merge_commit_email: &self.merge_bot_email,
         }