refactor: remote builder

[18alantom]

This PR is to be a refactor of #1475.

While the previous implementation works, it has a few issues that make it unsuitable for production and long term:

• Improper error handling, if docker build fails, press mostly just receives a CalledProcessError with irrelevant traceback. One needs to dive into agent logs to figure out what went wrong.
• Divergence from press build code, feat: remote docker image build support agent#83 is almost entirely a duplicate of deploy_candidate.py this is not a feasible approach, the code between the two has already diverged.

---

Agent side: frappe/agent#94

Note: this PR is incomplete, remote builder still isn't entirely ready, but since this PR has grown to above 1.2k line changes, I'm merging it as checkpoint.

TODO (will be addressed in a future PR):

• Proper error handling on agent side build failures (need to test it)
• Checking if it all works properly
• Method to clear bench app cache on remote builds
• Higher freq agent polling for build jobs
• Report to run command in docker cache

Things completed:

• Refactor handling of build and push output parsing
• Move output parsing from agent to press (prevent duplication and divergence)
• Add remote build related steps
• Improve debugging DX by linking Error Logs on Agent Jobs and Deploy Candidates
• Break remote build into 3 steps (previously it was only 1)
• Ensure that press build works properly

[codecov]

Codecov Report

Attention: Patch coverage is 45.85492% with 209 lines in your changes are missing coverage. Please review.

Project coverage is 38.69%. Comparing base (3308910) to head (524c8c5).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...press/doctype/deploy_candidate/deploy_candidate.py	26.06%	122 Missing ⚠️
.../doctype/deploy_candidate/docker_output_parsers.py	62.96%	70 Missing ⚠️
press/agent.py	25.00%	9 Missing ⚠️
press/press/doctype/agent_job/agent_job.py	70.58%	5 Missing ⚠️
...s/doctype/deploy_candidate/deploy_notifications.py	0.00%	2 Missing ⚠️
press/press/doctype/app_patch/app_patch.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1631      +/-   ##
==========================================
+ Coverage   38.66%   38.69%   +0.03%     
==========================================
  Files         316      317       +1     
  Lines       25172    25357     +185     
==========================================
+ Hits         9733     9813      +80     
- Misses      15439    15544     +105     

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[phot0n]

Improve debugging DX by linking Error Logs on Agent Jobs and Deploy Candidates

thanks for this ❤️ - been so annoyed by having to constantly keep an eye on error log.

[18alantom]

I am 75% sure the failing tests are unrelated to my PR (they're failing elsewhere too). And so I'm merging it, this really shouldn't be FC workflow, but it is. Will address it soon.