Integration test flakiness

[NDStrahilevitz]

Seems that we have some flakiness in the integration tests now. It might be related to the new tests i've added in #4016, but the logs don't seem related to it, but rather to leftover goroutines, which the new tests shouldn't spawn in parallel.

The results come from the filter tests and these are the logs:

=== NAME  Test_EventFilters
    event_filters_test.go:1776: found unexpected goroutines:
        [Goroutine 8 in state chan send, 5 minutes, with github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1.1 on top of the stack:
        github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1.1()
        	/home/runner/work/tracee/tracee/tests/testutils/exec.go:141 +0xcd
        created by github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1 in goroutine 7
        	/home/runner/work/tracee/tracee/tests/testutils/exec.go:136 +0x2c6
         Goroutine 278 in state chan send, 5 minutes, with github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1.1 on top of the stack:
        github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1.1()
        	/home/runner/work/tracee/tracee/tests/testutils/exec.go:141 +0xcd
        created by github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1 in goroutine 277
        	/home/runner/work/tracee/tracee/tests/testutils/exec.go:136 +0x2c6
         Goroutine 128 in state chan send, 5 minutes, with github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1.1 on top of the stack:
        github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1.1()
        	/home/runner/work/tracee/tracee/tests/testutils/exec.go:141 +0xcd
        created by github.com/aquasecurity/tracee/tests/testutils.ExecCmdBgWithSudoAndCtx.func1 in goroutine 127
        	/home/runner/work/tracee/tracee/tests/testutils/exec.go:136 +0x2c6
        ]
--- FAIL: Test_EventFilters (320.98s)

[yanivagman]

Done as part of #4044