Provide disableTimer option for testing

[imundra]

What changed? Why?

Some consumers of cookie manager were reporting issues around introducing the package and seeing failed tests around timer usage. There are some documented alternatives like using runOnlyPendingTimers in place of functions like runAllTimers but this can quickly become cumbersome to maintain especially if there are multiple timing related functions that are being used and developers need to remember what workarounds are available for them to work well.

Therefore, this PR introduces a disableTimer option on CookieProvider to avoid setting a timer for periodically checking cookies. This option is meant to be used in testing only.

Notes to reviewers

How has it been tested?

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2