OTWO-7708 Removed default setup of remember_token cookie

[bd-vaibhav]

No description provided.

[Copilot]

Pull request overview

This PR updates session handling so “remember me” behavior is driven by an explicit remember_me helper cookie (set from the sign-in checkbox) rather than a default persistent remember_token cookie setup, and adds coverage around that helper cookie.

Changes:

• Add a cookie_expiration policy to Clearance based on the remember_me helper cookie.
• Refactor SessionsController#create to delegate result handling and set/clear the remember_me cookie on successful sign-in.
• Add controller tests validating remember_me cookie behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/controllers/sessions_controller_test.rb	Adds tests asserting remember_me cookie is set/cleared based on the checkbox.
config/initializers/clearance.rb	Configures Clearance cookie_expiration based on a remember_me helper cookie and introduces a duration constant.
app/controllers/sessions_controller.rb	Refactors sign-in flow and sets/deletes the remember_me helper cookie.

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