pr05 Typescript #2: automatically resolve imports of ts files & migrate instance of client/utils file

[clairep94]

pr05 Typescript Migration: Auto-resolve import of ts files & migrate instance of client/utils file

IMPORTANT: Should be reviewed after #3533 for clarity

• This branch is built off of the branch for pr05 Typescript #1: Set up TS dependencies #3533 out of necessity, so there are commits that are unrelated to this ticket
• Relevant commits start at 8b6d4df

Context:

• Resolve issue with needing to update import extensions (eg. from js to ts), so that ts imports automatically resolve for both the client folder & tests
  • Not sure if this resolves imports for the server folder yet -- will resolve this on the PR to migrate an instance of a server file later if so
• Migrate instance of a client/utils file

Changes:

• Auto-resolve imports for local instance of project client folder
• Auto-resolve imports for jest tests
• Migrate client/utils/generateRandomName & associated mock
• Delete client/utils/isSecurePage -- checked and this utility function is unused in the project

Notes:

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[clairep94]

@khanniie @raclim

Should be reviewed after #3533 is merged for clarity

[khanniie]

LGTM to me so far but would love to re-approve once the first PR is in just to see the diff without the forked changes!