Feature/remove deprecated codelabs

[HariRangarajan-Solace]

Changes for :

• Removing the following deprecated codelabs:

1. Connecting Event Portal to a runtime Event Broker
2. Discover your Solace Event Streams with Event Portal
3. Event Portal: event-driven innovation that's faster, easier, more resilient

• Updating new EP codelab's duration calculation

✨ PR Description

Purpose: Update codelab documentation to use standardized duration format and remove deprecated codelab metadata configuration.

Main changes:

• Converted all duration values from text format (e.g., "5 minutes") to ISO 8601 format (e.g., "0:05:00") across nine codelab sections for consistency
• Updated AI Designer reference to AI Design Assistant in the learning objectives section
• Removed deprecated codelab metadata file (ep-connect-ep-broker) containing configuration for deprecated Event Portal connectivity codelab

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[solacecommunity-bot]

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[github-actions]

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[gitstream-cm]

✨ PR Review

LGTM

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[gitstream-cm]

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[TamimiGitHub]

LGTM