Ensure TSB is saved in config after deploy-mg and during pretest (#172)

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### Description of PR
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Summary:
Fixes #17246

### Type of change

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- Fill x for your type of change.
- e.g.
- [x] Bug fix
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- [x] Bug fix
- [x] Testbed and Framework(new/improvement)
- [ ] New Test case
 - [ ] Skipped for non-supported platforms
- [ ] Test case improvement

### Back port request
- [ ] 202012
- [ ] 202205
- [ ] 202305
- [ ] 202311
- [ ] 202405
- [ ] 202411

### Approach
#### What is the motivation for this PR?
Make sure tsa_enabled = false when startup_tsa_tsb is disabled through pretest
#### How did you do it?
Add config save after TSB is executed
#### How did you verify/test it?
Output `tsa_enabled` before and after pretest to make sure it is working is intended
#### Any platform specific information?
N/A
#### Supported testbed topology if it's a new test case?
N/A
### Documentation
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(If it's a new feature, new test case)
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Author: mssonicbld

ansible/config_sonic_basedon_testbed.yml

@@ -687,6 +687,11 @@
 
         when: "'dualtor-mixed' in topo or 'dualtor-aa' in topo"
 
+      - name: execute "TSB" on T2 DUTs
+        become: True
+        shell: "TSB"
+        when: "'t2' in topo"
+
       - name: execute cli "config save -y" to save current minigraph as startup-config
         become: true
         shell: config save -y

tests/test_pretest.py

@@ -394,6 +394,7 @@ def test_disable_startup_tsa_tsb_service(duthosts, localhost):
                 duthost.shell("sudo mv {} {}".format(startup_tsa_tsb_file_path, backup_tsa_tsb_file_path))
                 output = duthost.shell("TSB", module_ignore_errors=True)
                 pytest_assert(not output['rc'], "Failed TSB")
+                duthost.shell("sudo config save -y")
         else:
             logger.info("{} file does not exist in the specified path on dut {}".
                         format(startup_tsa_tsb_file_path, duthost.hostname))