[develop] Add loader on payment button ps16 if the page isn't completely loaded

[Benjamin-Freoua-Alma]

Reason for change

Linear task

Code changes

Add loader in payment button is page isn't completely loaded to display in-page correctly
https://components.storybook.alma.tech/?path=/story/components-button--button-primary

How to test

For Prestashop 1.6
1st Test
Install our module
Active the in-page option
Active slow 3G in network in console
And display the payment button with in-page and try to click on it

2nd Test
Active the one page checkout in the Preferences > Orders > Order process type, Save
In the front end, make the order, before click to payment button, change the quantity product (with and without eligibility)
And check the loader button and click to pay with Alma and In-Page

Checklist for authors and reviewers

• The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
• The PR implements the changes asked in the referenced task / issue
• The automated tests are compliant with the testing strategy
• The tests are relevant, and cover the corner/error cases, not only the happy path
• You understand the impact of this PR on existing code/features
• The changes include adequate logging and Datadog traces
• Documentation is updated (API, developer documentation, ADR, Notion...)

Non applicable

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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