[MOO-1915] - Remove fallback maven repos

[saurabhchavan1711]

Description

In this PR removed fallback maven repos. Its already removed in master and release/17.x.x branches. This are added 3 years back as Jitpack and jcenter are often down or causing the issues at that time.

Checklist

To ensure this pull request meets the requirements for merging, please complete the checklist below:

• Release Note: As a part of the release process, an automated PR will be created for the Mendix Docs repository relevant to the changes introduced in this PR. Post release, please ensure that the release note accurately reflects the changes and impacts of this PR.
• Breaking Changes: This PR introduces breaking changes (e.g., changes that require updates to existing configurations, dependencies).
  • If yes, I have documented these breaking changes and provided guidance for users to adapt.
  • Details about breaking changes: [Provide details here, if applicable]

This PR contains

• Bug fix
• Feature
• Refactor
• Documentation
• Other (describe)

Important Notes

• Make sure the release note accurately describes the changes and impacts introduced by this PR.