DX-377 Refactor Flakeguard: Separate runner, executor, and parser concerns (#1776)

* wip refactoring

* fix

* Enhance command execution in Flakeguard: capture stdout and stderr separately, improve error handling, and log absolute paths for temporary files.

* Use configs

* Refactor panic and race attribution functions in Flakeguard: update regex patterns for improved accuracy, change function names to exported versions, and enhance error handling for better clarity in failure cases.

* Add more tests

* Add integration tests for the runner package in Flakeguard

* fix go test

* simplify makefile

* Add unit tests for the runner package in Flakeguard: implement mock executors and parsers, and cover various scenarios including success, failure, and rerun cases.

* more refactoring

* refactor cmd/run.go

* Handle command-line-arguments when go test <file> is used

* cleanup comments

* Add unit test for parser to verify handling of parent failures in subtests

Author: lukaszcl

tools/flakeguard/Makefile

@@ -1,12 +1,12 @@
 .PHONY: test_unit
 test_unit:
-	go list ./... | grep -v 'example_test_package' | xargs go test -timeout 5m -json -cover -covermode=count -coverprofile=unit-test-coverage.out 2>&1 | tee /tmp/gotest.log | gotestloghelper -ci
+	go test ./... -timeout 5m -json -cover -covermode=count -coverprofile=unit-test-coverage.out 2>&1 | tee /tmp/gotest.log | gotestloghelper -ci
 
 .PHONY: test
 test:
 	go install github.com/gotesttools/gotestfmt/v2/cmd/gotestfmt@latest
 	set -euo pipefail
-	go list ./... | grep -v 'example_test_package' | xargs go test -json -cover -coverprofile unit-test-coverage.out -v 2>&1 | tee /tmp/gotest.log | gotestfmt
+	go test ./... -json -cover -coverprofile unit-test-coverage.out -v 2>&1 | tee /tmp/gotest.log | gotestfmt
 
 .PHONY: test-package
 test-package:
@@ -16,7 +16,7 @@ test-package:
 
 .PHONY: test-race
 test-race:
-	go list ./... | grep -v 'example_test_package' | xargs go test -count=1 -race
+	go test ./... -count=1 -race
 
 .PHONY: bench
 bench: