Add comprehensive validation for DTS connection strings including empty Authentication values

[Copilot]

When debugging Azure Functions projects with Durable Task Scheduler (DTS) storage type, users can click "Manually Set a Connection String" to provide a custom DTS connection string. Previously, there was no validation on this input, allowing users to enter invalid strings like "abc" or incomplete strings with empty Authentication values, which would cause issues later during debugging.

Changes Made

Enhanced the validation logic in DTSConnectionCustomPromptStep.ts to include comprehensive DTS connection string validation:

• Format validation: Ensures the connection string contains the required Endpoint= parameter
• URL validation: Validates that the endpoint is a properly formatted URL
• Protocol validation: Restricts protocols to HTTP/HTTPS only
• Authentication validation: Ensures the required Authentication= parameter is present
• Authentication value validation: Validates that the Authentication parameter has a non-empty value
• Clear error messages: Provides specific, actionable feedback for each validation failure

Before/After

Before: Users could enter "abc" or connection strings with empty Authentication values and the system would accept them without validation:

After: Invalid input now shows helpful validation errors explaining the expected format, including detection of empty Authentication values.

Expected Connection String Format

Valid DTS connection strings must follow this pattern:

Endpoint=<HTTP_OR_HTTPS_URL>;Authentication=<AUTH_TYPE>[;additional_params]

Examples of valid connection strings:

• Endpoint=http://localhost:55053/;Authentication=None (Local emulator)
• Endpoint=https://example.durabletask.io;Authentication=ManagedIdentity;ClientID=12345 (Remote)

Examples that will now fail validation:

• abc (Missing required parameters)
• Endpoint=http://localhost:55053/;Authentication= (Empty authentication value)
• Endpoint=invalid-url;Authentication=None (Invalid URL format)
• Endpoint=ftp://localhost;Authentication=None (Invalid protocol)

This change improves the user experience by catching configuration errors early and providing clear guidance on the correct format, preventing runtime debugging issues.

Fixes #4604.

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[MicroFish91]

@copilot Remove any changes to main.js

[MicroFish91]

This might work, I'll need test it later to verify

[Copilot]

@copilot Remove any changes to main.js

I've updated the implementation to better use validationUtils from the @microsoft/vscode-azext-utils package and reverted the changes to main.js. The validation now properly uses hasValidCharLength() and getInvalidCharLengthMessage() for basic validation, while keeping the necessary custom validation logic for DTS connection string format, endpoint URL validation, and authentication parameter checking (since these specific validators aren't available in validationUtils).

Changes in commit 493681b:

• Reverted main.js to use the original extension loading mechanism
• Maintained proper usage of validationUtils for character length validation
• Kept essential custom validation for DTS-specific requirements

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[MicroFish91]

@copilot Make sure to check after the suffix Authentication= to make sure there is actually a value on the other side of the equal sign. An empty equals value should not pass validation.

[Copilot]

Added validation for empty Authentication parameter values. The validation now checks that there's a non-empty value after Authentication= and provides the error message "DTS Authentication parameter cannot be empty" when the value is missing or whitespace-only. Commit ea72aa6.