chore: clean up test scripts

[dixonyant]

There are ci test scripts that are unviable and am opting to just remove them. We could rename them if we still want an option to run individual browsers in headless for local testing/tooling, but coverage will always be incomplete.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
arcgis-rest-basemap-sessions.src	100%	100%	0	✔
arcgis-rest-basemap-sessions.src.utils	100%	100%	0	✔
arcgis-rest-demographics.src	100%	100%	0	✔
arcgis-rest-developer-credentials.src	100%	100%	0	✔
arcgis-rest-developer-credentials.src.shared	100%	100%	0	✔
arcgis-rest-elevation.src	100%	100%	0	✔
arcgis-rest-feature-service.src	100%	100%	0	✔
arcgis-rest-geocoding.src	100%	100%	0	✔
arcgis-rest-places.src	100%	100%	0	✔
arcgis-rest-portal.src.groups	100%	100%	0	✔
arcgis-rest-portal.src.items	100%	100%	0	✔
arcgis-rest-portal.src.orgs	100%	100%	0	✔
arcgis-rest-portal.src.services	100%	100%	0	✔
arcgis-rest-portal.src.sharing	100%	100%	0	✔
arcgis-rest-portal.src.users	100%	100%	0	✔
arcgis-rest-portal.src.util	100%	100%	0	✔
arcgis-rest-request.src	100%	100%	0	✔
arcgis-rest-request.src.types	100%	100%	0	✔
arcgis-rest-request.src.utils	100%	100%	0	✔
arcgis-rest-routing.src	100%	100%	0	✔
Summary	100% (2182 / 2182)	100% (1209 / 1209)	0	✔

Minimum allowed line rate is 100%