openqa-investigate: Fix dry-run depending on presence of comments

[okurz]

This fixes the dry-run mode by returning from functions early or
simulating the output of "openqa-clone-job" when we would call
openqa-clone-job and parse its output.

Before:

$ dry_run=1 ./openqa-investigate 3876947
jq (161 ./openqa-investigate): jq: parse error: Invalid numeric literal at line 1, column 11 (rc: 5 Input: >>>openqa-cli api --header User-Agent: openqa-investigate (https://github.com/os-autoinst/scripts) --host https://aquarius.suse.cz --retries=3 -X POST jobs/20047/comments text=Starting investigation for job 20047<<<)

After:

$ dry_run=1 ./openqa-investigate 3876947
openqa-cli api --header User-Agent: openqa-investigate (https://github.com/os-autoinst/scripts) --host https://openqa.opensuse.org -X PUT jobs/3876947/comments/ text=Automatic investigation jobs for job 3876947:

openqa-clone-job --json-output --skip-chained-deps --max-depth 0 --parental-inheritance --within-instance https://openqa.opensuse.org/tests/3876947 TEST+=:investigate:retry _TRIGGER_JOB_DONE_HOOK=1 _GROUP_ID=0 BUILD= OPENQA_INVESTIGATE_ORIGIN=https://openqa.opensuse.org/t3876947
* **krypton-live:investigate:retry**: https://openqa.opensuse.org/tnull
openqa-clone-job --json-output --skip-chained-deps --max-depth 0 --parental-inheritance --within-instance https://openqa.opensuse.org/tests/3876947 TEST+=:investigate:last_good_tests:b1712f3140cbe7ab8f30cf0647e54aa433e3c401 _TRIGGER_JOB_DONE_HOOK=1 _GROUP_ID=0 BUILD= CASEDIR=https://github.com/os-autoinst/os-autoinst-distri-opensuse.git#b1712f3140cbe7ab8f30cf0647e54aa433e3c401 OPENQA_INVESTIGATE_ORIGIN=https://openqa.opensuse.org/t3876947
* **krypton-live:investigate:last_good_tests:b1712f3140cbe7ab8f30cf0647e54aa433e3c401**: https://openqa.opensuse.org/tnull
openqa-clone-job --json-output --skip-chained-deps --max-depth 0 --parental-inheritance --within-instance https://openqa.opensuse.org/tests/3836309 TEST+=:investigate:last_good_build:10.44 _TRIGGER_JOB_DONE_HOOK=1 _GROUP_ID=0 BUILD= OPENQA_INVESTIGATE_ORIGIN=https://openqa.opensuse.org/t3876947
* **krypton-live:investigate:last_good_build:10.44**: https://openqa.opensuse.org/tnull
openqa-clone-job --json-output --skip-chained-deps --max-depth 0 --parental-inheritance --within-instance https://openqa.opensuse.org/tests/3836309 TEST+=:investigate:last_good_tests_and_build:b1712f3140cbe7ab8f30cf0647e54aa433e3c401+10.44 _TRIGGER_JOB_DONE_HOOK=1 _GROUP_ID=0 BUILD= CASEDIR=https://github.com/os-autoinst/os-autoinst-distri-opensuse.git#b1712f3140cbe7ab8f30cf0647e54aa433e3c401 OPENQA_INVESTIGATE_ORIGIN=https://openqa.opensuse.org/t3876947
* **krypton-live:investigate:last_good_tests_and_build:b1712f3140cbe7ab8f30cf0647e54aa433e3c401+10.44**: https://openqa.opensuse.org/tnull

[*Detailed explanation of this comment*](https://github.com/os-autoinst/scripts#More-details-and-examples-about-openqa-investigate-comments)

Related progress issue: https://progress.opensuse.org/issues/153763

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏

[perlpunk]

Can you provide example output?
Do you get any output in case of calling it on an investigate:retry job?

[okurz]

Can you provide example output? Do you get any output in case of calling it on an investigate:retry job?

Yes, tried with https://openqa.opensuse.org/tests/3877133 . Then I am getting "Not found" which I consider acceptable as it does not show errors but that's just limitations.