feat: adapt PlatformTestingTool to work with Bytes for system transactions

[IvanKavaldzhiev]

Description:
Enhance PlatformTestingTool to work with Bytes format for StateSignatureTransactions.

Related issue(s):

Fixes #17082

Notes for reviewer:

Checklist

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

[andrewb1269hg]

Review and approve platform-sdk/platform-apps/tests/PlatformTestingTool/build.gradle.kts

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.71% (target: -1.00%)	✅ 57.46%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6e5da9b)	96684	69457	71.84%
Head commit (f59f6c5)	96724 (+40)	70171 (+714)	72.55% (+0.71%)

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 (#17367)	134	77	57.46%

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

Attention: Patch coverage is 56.71642% with 58 lines in your changes missing coverage. Please review.

Project coverage is 68.60%. Comparing base (6e5da9b) to head (f59f6c5).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...swirlds/demo/platform/PlatformTestingToolMain.java	44.23%	29 Missing ⚠️
.../com/swirlds/demo/platform/PttTransactionPool.java	0.00%	19 Missing ⚠️
...o/platform/PlatformTestingToolStateLifecycles.java	83.60%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17367      +/-   ##
============================================
+ Coverage     67.95%   68.60%   +0.65%     
- Complexity    22345    22477     +132     
============================================
  Files          2606     2606              
  Lines         96901    96941      +40     
  Branches      10098    10101       +3     
============================================
+ Hits          65850    66508     +658     
+ Misses        27292    26619     -673     
- Partials       3759     3814      +55     

Files with missing lines	Coverage Δ
.../java/com/swirlds/demo/platform/PayloadConfig.java	84.94% <100.00%> (+33.33%)	⬆️
...o/platform/PlatformTestingToolStateLifecycles.java	33.45% <83.60%> (+33.45%)	⬆️
.../com/swirlds/demo/platform/PttTransactionPool.java	21.92% <0.00%> (+0.95%)	⬆️
...swirlds/demo/platform/PlatformTestingToolMain.java	40.90% <44.23%> (+40.90%)	⬆️

... and 23 files with indirect coverage changes

[andrewb1269hg]

Review and approve platform-sdk/platform-apps/tests/PlatformTestingTool/build.gradle.kts

[andrewb1269hg]

Approve build.gradle.kts