Fix banner e2e test

[AnastasiiaBalenko]

What does this change?

This change fixes the banner e2e test, which passed successfully in PROD environment, but failed when running in CI/CD or locally.
The cause of failure was the error, which could be seen in browser console.log:
Cannot read properties of undefined (reading 'consents')
It prevented the script execution to continue. The reason for this was in the way the cmp was initialised in CI/CD environment. The loadPage call was setting region to 'GB' explicitly, but CI runs in the US. Apparently setting region to "GB" in loadPage was not enough for cmp initialisation to correctly determine geo-location and during debugging by pinging window.__tsfapi it was detected that gdprApplies was false. According to this document

If GDPR does not apply to this user in this context then only gdprApplies, tcfPolicyVersion, cmpId and cmpVersion shall exist in the object

This is why consents was null, which caused the error.
In @guardian/consent-manager platform there is an opportunity to force geo-location in non-prod environment with query parameter https://github.com/guardian/csnx/blob/a3a7bbe55e74811d79c943381eb31c4d8520313a/libs/%40guardian/consent-manager/src/export.ts#L67
With this query parameters in place the test successfully passes.
Also explicit override overrides: { switchOverrides: { consentManagement: true, }, }, was added to guaranty that the switch is on.

Why?

e2e test for banner failed

[github-actions]

Deploy build 28937 of dotcom:rendering-all to CODE

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• Deploy build 28937 of dotcom:rendering-all to CODE
• Deploy parts of build 28937 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[akash1810]

Please rebase this branch against main before deploying to CODE. #16321 made some changes to CI and infrastructure. Deploying this branch without these changes present will either:

• Fail when using Riff-Raff's default update strategy
• OR delete the new infrastructure if using Riff-Raff's "dangerous" mode

Please rebase this branch against main before deploying to CODE.

[github-actions]

Deploy build 2116 of dotcom:ab-testing to CODE

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• Deploy build 2116 of dotcom:ab-testing to CODE
• Deploy parts of build 2116 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[gu-prout]

Seen on PROD (merged by @AnastasiiaBalenko 20 minutes and 33 seconds ago) Please check your changes!