Update query-builder to use double quotes

[shreyabiradar07]

Description

Updated the filterbuilder logic to use double quotes for empty string comparisons

Fixes #1788

Type of change

• Bug fix
• New feature
• Docs update
• Breaking change (What changes might users need to make in their application due to this PR?)
• Requires DB changes

How has this been tested?

Please describe the tests that were run to verify your changes and steps to reproduce. Please specify any test configuration required.

• New Test X
• Functional testsuite

Test Configuration

• Kubernetes clusters tested on:

Checklist 🎯

• Followed coding guidelines
• Comments added
• Dependent changes merged
• Documentation updated
• Tests added or updated

Additional information

Include any additional information such as links, test results, screenshots here

Summary by Sourcery

Bug Fixes:

• Correct empty-string filter expression to use double quotes instead of single quotes in dynamically constructed queries.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts the query filter builder to use double quotes instead of single quotes when constructing non-empty string comparisons for metadata filters.

File-Level Changes

Change	Details	Files
Update empty-string comparison in dynamic filter construction to use double quotes to match expected query syntax.	Change the constructed filter expression from using single quotes around an empty string to using double quotes Keep include and exclude regex handling logic unchanged while aligning the empty-string comparison syntax with the rest of the query format	src/main/java/com/autotune/common/datasource/DataSourceMetadataOperator.java

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