Add end-to-end test to workflow_dispatch actions

[devspyrosv]

This PR, based on previous work by @weiiwang01, attempts to test the workflow dispatch action.

A new workflow workflow_dispatch_test.yaml is triggered in a separate job of e2e_test.yaml and its status is checked in intervals.

This PR should work after PR #84 is merged.

[yhaliaw]

LGTM

[github-actions]

Test coverage for 37684e8

Name                                    Stmts   Miss Branch BrPart  Cover   Missing
-----------------------------------------------------------------------------------
src/charm.py                              378     88     90     22    74%   126-128, 183-191, 203-207, 276->280, 301-306, 316, 325-326, 335-346, 367-369, 377-380, 386, 389-390, 401, 412->429, 417-422, 439-440, 444-445, 450-453, 466-467, 469-470, 504-512, 523-524, 542-544, 547->exit, 551-553, 576-581, 599-600, 602-603, 605-606, 638->640, 700-701, 714, 727
src/errors.py                              22      0      0      0   100%
src/event_timer.py                         42      8      4      0    74%   96-99, 119-122
src/firewall.py                            43     25     10      0    38%   38-42, 64-67, 75-149
src/github_type.py                         36      0      0      0   100%
src/lxd_type.py                            38      0      2      0   100%
src/repo_policy_compliance_service.py       5      5      0      0     0%   4-14
src/runner.py                             249     29     74     21    84%   40->44, 188-195, 201-207, 266-271, 276, 296, 329->332, 335-337, 344, 358, 368, 372, 374, 389, 433-438, 448, 532, 567, 593, 598-610, 624, 642
src/runner_manager.py                     219     25     88      9    88%   204-206, 219-220, 232-234, 240-245, 249-250, 260-261, 277, 332, 357-361, 380, 398, 541, 561
src/runner_type.py                         52      0     12      0   100%
src/utilities.py                           68      6     20      8    84%   74->76, 78->84, 89-91, 119, 132, 167, 220
-----------------------------------------------------------------------------------
TOTAL                                    1152    186    300     60    81%

Static code analysis report

Run started:2023-07-25 08:03:35.767250

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 2573
  Total lines skipped (#nosec): 0
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 9

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):