Update R kernel installation, remove dependency on r studio CDN #147

Job	Run time
charts-tests / Chart Data Extractor - Build and test	31s
build-template / Build E2B Template	9m 5s
js-sdk / JS SDK - Build and test	2m 16s
python-sdk / Python SDK - Build and test	7m 51s
cleanup-build-template / Cleanup Build Template	13s
build-template / Build E2B Template	9m 5s
charts-tests / Chart Data Extractor - Build and test	31s
js-sdk / JS SDK - Build and test	24s
python-sdk / Python SDK - Build and test	7m 51s
cleanup-build-template / Cleanup Build Template	12s
build-template / Build E2B Template	9m 10s
charts-tests / Chart Data Extractor - Build and test	38s
python-sdk / Python SDK - Build and test	8m 46s
js-sdk / JS SDK - Build and test	2m 43s
cleanup-build-template / Cleanup Build Template	14s
	59m 30s

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