feat: Add mimeType support; Improve TypedArray support

[BlueWinds]

• Closes 9.3.0: selectFile: missing mimeType #19751

User facing changelog

.selectFile() automatically infers the mime type of files based on their extension, and allows users to set it explicitly using the mimeType property on files.

In addition, users can specify the file contents with any TypedArray instance. Previously only instances of Cypress.Buffer were supported.

Additional details

Example:

cy.get('input[type=file]').selectFile({
  contents: Uint8Array.from('567'),
  mimeType: 'text/plain',
})

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• Has a PR for user-facing changes been opened in cypress-documentation? Add mimeType property and ArrayBuffer support cypress-documentation#4317
• Have API changes been updated in the type definitions?
• [N/A] Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[cypress]

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Test summary

19141 • 0 • 218 • 0 • 2

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Run details

Project	cypress
Status	Passed
Commit	61c2ab9
Started	Jan 21, 2022 6:12 PM
Ended	Jan 21, 2022 6:24 PM
Duration	11:36 💡
OS	Linux Debian - 10.10
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	settings_spec.js		1
1	Settings > file preference panel > loads preferred editor, available editors and shows spinner
	cypress/proxy-logging_spec.ts		1
1	Proxy Logging > request logging > xhr log has response body/status code

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