Validate session flag format in subset command

[gayanW]

Before:
Previously --session flag was not validated when the observation mode is on.

% launchable subset --help
Usage: launchable subset [OPTIONS] COMMAND [ARGS]...
  Subsetting tests
Options:
  .....
  --session TEXT                  Test session ID

% launchable subset --target 25% --session 4785415 --observation gradle src/test/java              
An error occurred on Launchable CLI. You can ignore this message since the process will continue. 
Error: HTTPSConnectionPool(host='api.mercury.launchableinc.com', port=443): Max retries exceeded with url: /intake/organizations/defaulttm/workspaces/my-initial-tests/4785415 (Caused by ResponseError('too many 500 error responses'))
--tests example.MulTest --tests example.Add2Test --tests example.DB1Test --tests example.DB0Test --tests example.AddTest --tests example.SubTest --tests example.DivTest --tests example.File1Test --tests example.File0Test

The above command would send requests to intake server with invalid session string.

After:

% launchable subset --help
Usage: launchable subset [OPTIONS] COMMAND [ARGS]...
  Subsetting tests
Options:
  .....
  --session TEXT                  In the format builds/<build-
                                  name>/test_sessions/<test-session-id>

% launchable subset --target 25% --session 4785415 --observation gradle src/test/java                           
An error occurred on Launchable CLI. You can ignore this message since the process will continue. 
Error: Wrong session format; session format is like 'builds/<build name>/test_sessions/<test session id>'.: 4785415
--tests example.MulTest --tests example.Add2Test --tests example.DB1Test --tests example.DB0Test --tests example.AddTest --tests example.SubTest --tests example.DivTest --tests example.File1Test --tests example.File0Test

The session flag value is now validated in the CLI side.

And the command now outputs more appropriate error indicating that the session format is invalid.

[ono-max]

@gayanW

You can do that in another PR, but could you update the CLI option description in launchable record tests and launchable record attachment as well?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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