Fix: Clear text transmission of sensitive cookie code scanning alerts

[DarioR01]

Resolves N/A

Overall change: Adds secure attribute to analyticsUtils cookie as suggested by the code scanning

js-cookies docs

Code changes:

• adds secure attribute to analyticsUtils cookie.

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• [ ] I have assigned myself to this PR and the corresponding issues
• [ ] I have added the cross-team label to this PR if it requires visibility across World Service teams
• [ ] I have assigned this PR to the Simorgh project
• [ ] (BBC contributors only) This PR follows the repository use guidelines

Testing:

• [ ] Automated (jest and/or cypress) tests added (for new features) or updated (for existing features)
• [ ] If necessary, I have run the local E2E non-smoke tests relevant to my changes (CYPRESS_APP_ENV=local CYPRESS_SMOKE=false yarn test:e2e:interactive)
• [ ] This PR requires manual testing

[DarioR01]

https://github.com/bbc/simorgh/blob/e37762a5f4a068255ffd9978a716305b482d8f36/src/app/legacy/containers/PageHandlers/withOptimizelyProvider/getOptimizelyUserId/index.js#L17

Might as well add it here while you're at it

Added 👌