fix(component/modal): manage long content by default

[tiloyi]

I have read the contributing guidelines

• [x] Yes
• [ ] No

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Describe the changes

Manage long content by default

This PR changes the Modal component code so that long content is managed by default without the need to add a modifier. The code therefore makes the following changes:

• Delete the mc-modal--overflow modifier
• Removal of the shadow on the footer (to be ISO with Figma mock-ups)
• Inclusion of certain style evolutions made on the Mozaic-React side

GitHub issue number or Jira issue URL: N/A

Other information

[mohamedMok]

Checkmarx One – Scan Summary & Details – acac26dd-3783-4ca5-b3ca-2f51150d7dd1

New Issues

Severity	Issue	Source File / Package	Checkmarx Insight
	CVE-2023-32695	Npm-socket.io-parser-4.2.2	Vulnerable Package