feat: add Init before AddInstance while backing up

[mlycore]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

Using gs_probackup init to init dn-backup-path before AddInstance

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

Attention: 923 lines in your changes are missing coverage. Please review.

Comparison is base (3604a24) 39.71% compared to head (8cb6480) 36.81%.
Report is 240 commits behind head on main.

Files	Patch %	Lines
...phere-operator/pkg/controllers/chaos_controller.go	0.00%	276 Missing ⚠️
...perator/pkg/controllers/storage_node_controller.go	26.58%	96 Missing and 20 partials ⚠️
...operator/pkg/controllers/auto_scaler_controller.go	0.00%	89 Missing ⚠️
pitr/agent/internal/pkg/opengauss.go	6.52%	86 Missing ⚠️
pitr/cli/internal/cmd/delete.go	67.45%	43 Missing and 12 partials ⚠️
pitr/cli/pkg/prettyoutput/progress.go	8.51%	43 Missing ⚠️
pitr/cli/internal/pkg/local-storage.go	11.11%	37 Missing and 3 partials ⚠️
...ator/cmd/shardingsphere-operator/manager/option.go	6.06%	31 Missing ⚠️
pitr/cli/internal/cmd/backup.go	74.78%	28 Missing and 2 partials ⚠️
pitr/cli/internal/cmd/common.go	77.77%	16 Missing and 8 partials ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #480      +/-   ##
==========================================
- Coverage   39.71%   36.81%   -2.90%     
==========================================
  Files          51       60       +9     
  Lines        6083     6945     +862     
==========================================
+ Hits         2416     2557     +141     
- Misses       3448     4142     +694     
- Partials      219      246      +27     

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