fix: Additional Airdrop to Contracts e2e test cases

[stoyanov-st]

Description:

This PR aims to include additional test cases for Airdrops to Contracts.
This PR also adds additional overloaded helper methods for reusability and ease of testing.

Related issue(s):

Fixes #16248
Fixes #16249
Fixes #16250
Fixes #16251
Fixes #16252
Fixes #16253
Fixes #16254
Fixes #16255

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c780fb6)	97916	64158	65.52%
Head commit (935a526)	97916 (+0)	64156 (-2)	65.52% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#16778)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.82%. Comparing base (c780fb6) to head (935a526).
Report is 26 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #16778      +/-   ##
=============================================
- Coverage      63.82%   63.82%   -0.01%     
+ Complexity     20551    20549       -2     
=============================================
  Files           2540     2540              
  Lines          95151    95151              
  Branches        9941     9941              
=============================================
- Hits           60729    60726       -3     
- Misses         30803    30805       +2     
- Partials        3619     3620       +1     

see 1 file with indirect coverage changes

[lukelee-sl]

LGTM