Convert Modal and BaseModal to TypeScript #390

Job	Run time
Install deps	19s
Build Self Hosted Image / Build Self Hosted App	4m 22s
Run Type Checker	1m 6s
Generate runner indexes	5s
Run Lint	3m 55s
Run Fossa	21s
Run storybook	3m 25s
Codecov Startup / Codecov Startup	20s
Test Runner #0	3m 9s
Test Runner #1	3m 6s
Test Runner #2	2m 25s
Test Runner #3	2m 12s
Test Runner #4	1m 52s
Test Runner #5	1m 55s
Build App	1s
Build Self Hosted Image / Push Self Hosted Release Image	1s
Build Self Hosted Image / Push Self Hosted Image	1s
Push Self Hosted Image	1s
	28m 36s

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