Sort VPCConfig fields in live manifest and enhance tests

[rishichirchi]

What this PR does / why we need it:

Fix false drift detection for Lambda applications with VPC configuration.

In PR #5254, the same subnet ordering problem was fixed for ECS drift detection by sorting subnets on both the live state and head spec sides.
However, this fix was never applied to Lambda drift detection.

The ignoreAndSortParameters function only sorted headSpec.VPCConfig.SubnetIDs (Git side), and the comment claimed "Lambda sorts them in liveSpec" but the AWS Lambda API does not guarantee any specific ordering of SubnetIDs or SecurityGroupIDs. This caused false drift detection when the ordering returned by AWS didn't match the user's manifest.

This fix:

• Adds sortLiveManifestParameters() to sort SubnetIDs and SecurityGroupIDs on the live (AWS) side before comparison, consistent with the ECS fix in Sort subnet in live manifest of ECS Drift Detection #5254
• Also sorts SecurityGroupIDs on the head (Git) side, which was previously not sorted at all
• Adds test coverage for the new sortLiveManifestParameters function and for SecurityGroupIDs sorting

Which issue(s) this PR fixes:

Fixes #6529

Does this PR introduce a user-facing change?:

• How are users affected by this change: Lambda applications with VPC configuration will no longer show false OUT_OF_SYNC status caused by inconsistent ordering of SubnetIDs and SecurityGroupIDs between the user's manifest and the AWS Lambda API response.
• Is this breaking change: No