fix(middleware-sdk-rds): stop throw when source id key is optional

[AllanZhengYP]

Issue

Resolves: #2762

Description

The ReplicationSourceIdentifier key in CreateDBCluster is optional. So the SDK should NOT throw if the key is not supplied. This change stop throwing the error.

Testing

Unit test

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[codecov-commenter]

Codecov Report

Merging #2770 (a482da5) into main (6e8ddd7) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2770      +/-   ##
==========================================
- Coverage   60.12%   60.12%   -0.01%     
==========================================
  Files         548      548              
  Lines       28559    28556       -3     
  Branches     6990     6989       -1     
==========================================
- Hits        17172    17170       -2     
+ Misses      11387    11386       -1     

Impacted Files	Coverage Δ
packages/middleware-sdk-rds/src/index.ts	91.66% <100.00%> (+1.92%)	⬆️

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