Begin adding app tests for block rendering and file upload

[ml-evs]

Long overdue, this will hopefully allow us to test file upload and block creation more easily.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.38%. Comparing base (21ed72d) to head (beeec1e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #938   +/-   ##
=======================================
  Coverage   68.38%   68.38%           
=======================================
  Files          62       62           
  Lines        3928     3928           
=======================================
  Hits         2686     2686           
  Misses       1242     1242           

[cypress]

datalab    Run #2590

Run Properties:   Failed #2590  •  39b2c45d47 ℹ️: Merge beeec1e6a796e833181be8251c2bb840da5ca1f6 into 21ed72d35f6b26d3670d1bfba22a...

Project	datalab
Run status	Failed #2590
Run duration	05m 05s
Commit	39b2c45d47 ℹ️: Merge beeec1e6a796e833181be8251c2bb840da5ca1f6 into 21ed72d35f6b26d3670d1bfba22a...
Committer	Matthew Evans
View all properties for this run ↗︎

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Test results
Failures	6
Flaky	0
Pending	0
Skipped	0
Passing	132

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Tests for review

  cypress/e2e/editPage.cy.js • 2 failed tests • End-to-end tests (firefox)

View Output

Test		Artifacts
Edit Page > Clicks the upload buttons and checks that the modals are shown		Screenshots
Edit Page > Uploads an XRD file, makes an XRD block and checks that the plot works		Screenshots

  cypress/e2e/editPage.cy.js • 2 failed tests • End-to-end tests (electron)

View Output

Test		Artifacts
Edit Page > Clicks the upload buttons and checks that the modals are shown		Test Replay Screenshots
Edit Page > Uploads an XRD file, makes an XRD block and checks that the plot works		Test Replay Screenshots

  cypress/e2e/editPage.cy.js • 2 failed tests • End-to-end tests (chrome)

View Output

Test		Artifacts
Edit Page > Clicks the upload buttons and checks that the modals are shown		Test Replay Screenshots
Edit Page > Uploads an XRD file, makes an XRD block and checks that the plot works		Test Replay Screenshots