Add missing insulated disablePreviews tags to webUI feature files

[phil-davis]

Description

While investigating issue #34689 I noticed that some webUI feature files did not have the "standard" tags:
insulated - behat-mink-selenium will restart the browser between each scenario - gives better isolation
disablePreviews - when not doing tests that check for previews display, avoids the slowness of previews being constantly generated and slowly drawing up on the UI (not always directly relevant to particular tests, but does reduce the "noise" as the test logs in and the files page is displayed)

Make all the webUI feature files consistent. And it might help the issue.

Related Issue

#34689

Motivation and Context

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[codecov]

Codecov Report

Merging #34715 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #34715   +/-   ##
=========================================
  Coverage     65.28%   65.28%           
  Complexity    18481    18481           
=========================================
  Files          1210     1210           
  Lines         69984    69984           
  Branches       1280     1280           
=========================================
  Hits          45688    45688           
  Misses        23924    23924           
  Partials        372      372

Flag	Coverage Δ	Complexity Δ
#javascript	53.04% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.68% <ø> (ø)	18481 <ø> (ø)	⬇️

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[phil-davis]

Backport stable10 #34716