fix: enhance report content handling with key-based signature on summary

[k1LoW]

This pull request updates the logic for adding report content to the GitHub Actions summary file, allowing for targeted and idempotent updates using a signature based on a key. The changes ensure that content blocks can be uniquely identified and replaced if they already exist, rather than always appending new content.

Improvements to summary file handling:

• Updated addReportContentToSummary in cmd/summary.go to accept a key parameter, generate a unique signature, and replace existing content blocks with the same signature instead of always appending. This uses the repin library for block replacement and improves idempotency and clarity of the summary file.
• Modified the call to addReportContentToSummary in cmd/root.go to pass the appropriate key parameter, aligning with the new function signature and behavior.

[github-actions]

Code Metrics Report

	main (182e240)	#565 (8050d22)	+/-
Coverage	51.5%	51.3%	-0.2%
Code to Test Ratio	1:0.6	1:0.6	-0.1
Test Execution Time	31s	30s	-1s

Details

  |                     | main (182e240) | #565 (8050d22) |  +/-  |
  |---------------------|----------------|----------------|-------|
- | Coverage            |          51.5% |          51.3% | -0.2% |
  |   Files             |             53 |             53 |     0 |
  |   Lines             |           3963 |           3976 |   +13 |
+ |   Covered           |           2042 |           2043 |    +1 |
- | Code to Test Ratio  |          1:0.6 |          1:0.6 |  -0.1 |
  |   Code              |           7708 |           7730 |   +22 |
  |   Test              |           4869 |           4869 |     0 |
+ | Test Execution Time |            31s |            30s |   -1s |

Code coverage of files in pull request scope (22.2% → 21.9%)

Files	Coverage	+/-	Status
cmd/root.go	0.0%	0.0%	modified
cmd/summary.go	0.0%	0.0%	modified
config/config.go	62.1%	+0.5%	affected

Benchmark-0 (this is custom metrics test)

	main (182e240)	#565 (8050d22)	+/-
Number of iterations	1000	1000	0
Nanoseconds per iteration	676.5 ns/op	676.5 ns/op	0 ns/op

Metadata

	main (182e240)	#565 (8050d22)
GOOS	darwin	darwin
GOARCH	amd64	amd64

Benchmark-1 (this is custom metrics test)

	main (182e240)	#565 (8050d22)	+/-
Number of iterations	1500	1500	0
Nanoseconds per iteration	1345 ns/op	1345 ns/op	0 ns/op

Metadata

	main (182e240)	#565 (8050d22)
GOOS	darwin	darwin
GOARCH	amd64	amd64

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Reported by octocov