Bug 1720045: Add polyfill for AbortController

[TheRealJon]

AbortController/AbortSignal is not supported in some older browser versions. Added a polyfill which prevents a runtime error where AbortController is undefined in those browsers. When AbortController is unsupported, the polyfill will cause in-flight fetch promises to reject when the abort signal is triggered.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1720045

[openshift-ci-robot]

@TheRealJon: This pull request references a valid Bugzilla bug.

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In response to this:

Bug 1720045: Add polyfill for AbortController

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[spadgett]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spadgett, TheRealJon

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[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.