chore: stability pr for changes (#35911)

## Description
- Changes to put blocking calls on the bounded elastic thread.
- This Pr has changes to test.
- commit
- Status
- branch
- delete branch
- List branch 
- checkout
- checkout remote
- merge status
- merge

Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`

## Automation

/ok-to-test tags="@tag.Git"

### 🔍 Cypress test results
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> [!CAUTION]  
> If you modify the content in this section, you are likely to disrupt
the CI result for your PR.

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## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Improved performance and responsiveness when saving applications to
Git repositories by optimizing the execution flow.
- Enhanced clarity and control in the application push process to Git,
ensuring better maintainability.

- **Bug Fixes**
- Addressed potential threading issues by ensuring operations run on the
appropriate scheduler.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/server/appsmith-git/src/main/java/com/appsmith/git/service/ce/GitExecutorCEImpl.java

@@ -224,10 +224,8 @@ public class GitExecutorCEImpl implements GitExecutor {
         // open the repo
         Path baseRepoPath = createRepoPath(repoSuffix);
 
-        return gitConfig
-                .getIsAtomicPushAllowed()
-                .flatMap(isAtomicPushAllowed -> {
-                    return Mono.using(
+        return gitConfig.getIsAtomicPushAllowed().flatMap(isAtomicPushAllowed -> {
+            return Mono.using(
                             () -> Git.open(baseRepoPath.toFile()),
                             git -> Mono.fromCallable(() -> {
                                         log.debug(Thread.currentThread().getName() + ": pushing changes to remote "
@@ -265,9 +263,12 @@ public class GitExecutorCEImpl implements GitExecutor {
                                     .timeout(Duration.ofMillis(Constraint.TIMEOUT_MILLIS))
                                     .name(GitSpan.FS_PUSH)
                                     .tap(Micrometer.observation(observationRegistry)),
-                            Git::close);
-                })
-                .subscribeOn(scheduler);
+                            Git::close)
+                    // this subscribeOn on is required because Mono.using
+                    // is not deferring the execution of push and for that reason it runs on the
+                    // lettuce-nioEventLoop thread instead of boundedElastic
+                    .subscribeOn(scheduler);
+        });
     }
 
     /** Clone the repo to the file path : container-volume/orgId/defaultAppId/repo/<Data>

app/server/appsmith-server/src/main/java/com/appsmith/server/helpers/ce/CommonGitFileUtilsCE.java

@@ -34,6 +34,7 @@ import org.springframework.context.annotation.Import;
 import org.springframework.stereotype.Component;
 import reactor.core.Exceptions;
 import reactor.core.publisher.Mono;
+import reactor.core.scheduler.Schedulers;
 
 import java.io.IOException;
 import java.nio.file.Path;
@@ -93,7 +94,9 @@ public class CommonGitFileUtilsCE {
 
         // Save application to git repo
         try {
-            return fileUtils.saveApplicationToGitRepo(baseRepoSuffix, artifactGitReference, branchName);
+            return fileUtils
+                    .saveApplicationToGitRepo(baseRepoSuffix, artifactGitReference, branchName)
+                    .subscribeOn(Schedulers.boundedElastic());
         } catch (IOException | GitAPIException e) {
             log.error("Error occurred while saving files to local git repo: ", e);
             throw Exceptions.propagate(e);