Remove test end file

[danth]

Previously, the Python script would poll for the existence of a test end file, which was created by the control client test driver. The Python script would send SIGTERM to launch manager once the file appeared.

Now, the control client test driver just sends SIGTERM directly to launch manager.

This setup has been a source of flakiness in the past, so removing it may help. Also, it allows us to drop a patch on ITF as we are no longer affected by that bug.

Thanks to @MaciejKaszynski for exploring this the other day 😄

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run --lockfile_mode=error //:license-check

Status: ⚠️ Needs Review

Click to expand output

[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.7.0) and connecting to it...
INFO: Invocation ID: e8e9ee55-558a-4895-bacb-759837bba8c8
Computing main repo mapping: 
Computing main repo mapping: 
Loading: 
Loading: 0 packages loaded
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    currently loading: 
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    currently loading: 
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    currently loading: 
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    currently loading: 
Analyzing: target //:license-check (1 packages loaded, 0 targets configured)
Analyzing: target //:license-check (1 packages loaded, 0 targets configured)

Analyzing: target //:license-check (41 packages loaded, 10 targets configured)

Analyzing: target //:license-check (131 packages loaded, 366 targets configured)

Analyzing: target //:license-check (155 packages loaded, 5133 targets configured)

Analyzing: target //:license-check (160 packages loaded, 6259 targets configured)

Analyzing: target //:license-check (165 packages loaded, 6308 targets configured)

Analyzing: target //:license-check (165 packages loaded, 6308 targets configured)

Analyzing: target //:license-check (168 packages loaded, 9533 targets configured)

Analyzing: target //:license-check (172 packages loaded, 11429 targets configured)

INFO: Analyzed target //:license-check (173 packages loaded, 11555 targets configured).
[12 / 16] JavaToolchainCompileClasses external/rules_java+/toolchains/platformclasspath_classes; 0s disk-cache
INFO: Found 1 target...
Target //:license.check.license_check up-to-date:
  bazel-bin/license.check.license_check
  bazel-bin/license.check.license_check.jar
INFO: Elapsed time: 23.748s, Critical Path: 0.35s
INFO: 16 processes: 4 disk cache hit, 12 internal.
INFO: Build completed successfully, 16 total actions
INFO: Running command line: bazel-bin/license.check.license_check ./formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
       [-confidence <int>] [-ef <url>] [-excludeSources <sources>] [-help] [-lic
       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]