[Frontend] Remove react imports in agency dashboard

[terryttsai]

Description of the change

As of React 17, there's no need to import React in every tsx file. See https://www.reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html#eslint

Will follow this up with removing React imports in Publisher and common, might have to update something or change a config to support that!

Type of change

All pull requests must have at least one of the following labels applied (otherwise the PR will fail):

Label	Description
Type: Bug	non-breaking change that fixes an issue
Type: Feature	non-breaking change that adds functionality
Type: Breaking Change	fix or feature that would cause existing functionality to not work as expected
Type: Non-breaking refactor	change addresses some tech debt item or prepares for a later change, but does not change functionality
Type: Configuration Change	adjusts configuration to achieve some end related to functionality, development, performance, or security
Type: Dependency Upgrade	upgrades a project dependency - these changes are not included in release notes

Related issues

Closes #XXXX

Checklists

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[mxosman]

You can leave publisher for me if you want - I don't mind cleaning that up after the settings feature.

[mxosman]

This is just set once here, right? No need to update publisher's eslintrc or will we have to do that as well?

[terryttsai]

Both apps read off the same eslintrc!

[mxosman]

Oh cool - didn't know you could set a port in a start script like that!

[lilidworkin]

Cool! Curious, what's the benefit of this? Performance improvement?

@mxosman I think it's okay for you to leave the Publisher parts to @terryttsai as well, though thanks for offering! You have enough on your plate with playtesting and the refactor after :)

[lilidworkin]

@terryttsai what's the status of this PR?

[terryttsai]

Should be good to go for agency-dashboard, so maybe I can get this PR merged in for now? I ran into lint errors trying to remove React imports in the publisher app and hadn't had the chance to figure out the issue