Fix speaker UI broken and remove sso login with customer account

[lcduong]

This PR solves issue speaker UI got broken due to sync commits from upstream, and remove feature login with customer account as customer feature is removed from tickets system.

How has this been tested?

Checklist

• I have added tests to cover my changes.

Summary by Sourcery

Fix the broken speaker UI by removing conflicting CSS styles and eliminate the SSO login feature with customer accounts due to the removal of the customer feature.

Bug Fixes:

• Fix the broken speaker UI by removing conflicting CSS styles.

Enhancements:

• Remove the SSO login feature with customer accounts as the customer feature is no longer supported.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR removes the broken speaker UI components and eliminates the SSO login functionality for customer accounts. The changes primarily involve removing CSS styles related to the schedule header and navigation, as well as removing the customer account login integration from the authentication template.

Class diagram for the removal of SSO login functionality

classDiagram
    class AuthTemplate {
        - Eventyay-Ticket SSO login button
    }
    note for AuthTemplate "The Eventyay-Ticket SSO login button has been removed."

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File-Level Changes

Change	Details	Files
Remove schedule header and navigation styles from the agenda CSS	Remove schedule-header flex container styles Remove color contrast calculation functions and mixins Remove schedule navigation component styles Remove header-right component styles	src/pretalx/static/agenda/css/_agenda.css
Remove customer account SSO login functionality	Remove the Eventyay ticket login button and related conditional logic Remove social app existence check template logic	src/pretalx/common/templates/common/auth.html src/pretalx/common/templatetags/socialapp_extras.py

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[sourcery-ai]

Hey @lcduong - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please provide more details about what specifically broke in the speaker UI and how removing these CSS styles fixes the issue. Consider splitting the CSS changes into a separate PR from the authentication changes.
• The removal of SSO login functionality should include tests to verify the remaining authentication flows still work correctly.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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