fix(agent): Propagate non-job request exceptions to foreground

[balamurali27]

For requests that aren't jobs, it's easier to debug the cause if they are propagated to frontend rather than logged.

Like so:

This PR does 3 things:

• Throw actual error from agent into frontend rather than raise_for_status
• Create Agent Request Failure for non job requests that fail without response from agent
• Not create error log for non job reqs
• [ ] Reduce pressure on server from polling?

Eg: Login as admin
ref: https://support.frappe.io/helpdesk/tickets/27474 was failing due to journeys app. Had to ssh and run the command to see what the issue was. Another case: https://support.frappe.io/helpdesk/tickets/27477

Needs frappe/agent#149 for nicely formatted output as in image

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 15 lines in your changes missing coverage. Please review.

Project coverage is 38.32%. Comparing base (1c66914) to head (40c6994).

Files with missing lines	Patch %	Lines
press/agent.py	57.14%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2382      +/-   ##
==========================================
- Coverage   38.34%   38.32%   -0.02%     
==========================================
  Files         378      378              
  Lines       29543    29545       +2     
==========================================
- Hits        11328    11323       -5     
- Misses      18215    18222       +7     

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