test: allow tests to be run multiple times

[reubenmiller]

Allow running tests multiple times using:

just TEST_ITERATIONS=10 test

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
38	0	2	38	100	16m13.096945s

Passed Tests

Name	⏱️ Duration	Suite
Ignore Containers Marked With A Specific Label	27.477 s	Container
Grace period to allow container to startup	5.032 s	Operations
Service is up	0.132 s	Operations
Get Logfile Request	2.359 s	Operations
Get Configuration File	4.680 s	Operations
Execute Shell Command	2.352 s	Operations
Install application using docker compose	15.307 s	Operations
Get Container Logs	2.351 s	Operations
Get Container Logs without explicit container name	2.366 s	Operations
Get Container Logs For Non-existent container	2.353 s	Operations
Update From Legacy Versions	134.524 s	Self-Update-Compat
Trigger self update via local command	24.702 s	Self-Update
Self update should only update if there is a new image	20.837 s	Self-Update
Self update using software update operation	105.819 s	Self-Update
Rollback when trying to install a non-tedge based image	21.279 s	Self-Update
Self update using software update operation using Container type	108.339 s	Self-Update
Cloud Connection is Online	0.146 s	Telemetry
Service status	0.238 s	Telemetry
Sends measurements	2.453 s	Telemetry
Ignore Containers Marked With A Specific Label	27.749 s	Container
Grace period to allow container to startup	5.029 s	Operations
Service is up	0.135 s	Operations
Get Logfile Request	2.349 s	Operations
Get Configuration File	4.673 s	Operations
Execute Shell Command	2.348 s	Operations
Install application using docker compose	13.430 s	Operations
Get Container Logs	2.344 s	Operations
Get Container Logs without explicit container name	2.346 s	Operations
Get Container Logs For Non-existent container	2.346 s	Operations
Update From Legacy Versions	140.215 s	Self-Update-Compat
Trigger self update via local command	25.111 s	Self-Update
Self update should only update if there is a new image	21.883 s	Self-Update
Self update using software update operation	106.637 s	Self-Update
Rollback when trying to install a non-tedge based image	22.349 s	Self-Update
Self update using software update operation using Container type	108.519 s	Self-Update
Cloud Connection is Online	0.144 s	Telemetry
Service status	0.239 s	Telemetry
Sends measurements	2.450 s	Telemetry