RDS supports querying task status through job id

[Lance52259]

What this PR does / why we need it:
Query job status check to ensure correctness of rds (single and read replica) resource status during update.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged):

NONE

Special notes for your reviewer:

Release note:

1. new function to get rds job status.

[coveralls]

Pull Request Test Coverage Report for Build 1225

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 68.171%

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Totals
Change from base Build 1220:	0.0%
Covered Lines:	11559
Relevant Lines:	16956

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1225

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 68.171%

---

Totals
Change from base Build 1220:	0.0%
Covered Lines:	11559
Relevant Lines:	16956

---

💛 - Coveralls