fix: handle exists and nexists for mat columns and top level columns

[nityanandagohain]

Fixes #6584

Now the logic for exists/nexists is similar to that of logs. For top level columns it will try to check if it's empty string or number is not equal to zero.

For materialized columns it will use the exists column for that materialized column.

This needs to be released before releasing this

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Important

Refactor exists/not exists handling for top-level and materialized columns in query_builder.go, updating tests accordingly.

• Behavior:
  • Updated logic for exists and not exists operators in query_builder.go to handle both top-level and materialized columns.
  • For top-level columns, checks if string is empty or number is not zero.
  • For materialized columns, uses the exists column.
• Functions:
  • Added getExistsNexistsFilter() in query_builder.go to centralize exists/not exists logic.
  • Removed existsSubQueryForFixedColumn() as its logic is now in getExistsNexistsFilter().
• Tests:
  • Updated Test_buildTracesFilterQuery and Test_buildTracesQuery in query_builder_test.go to reflect new exists/not exists logic.
  • Adjusted expected outputs in tests to match new query format.

^{This description was created by for 161f5fd. It will automatically update as commits are pushed.}

[ellipsis-dev]

❌ Changes requested. Reviewed everything up to 161f5fd in 2 minutes and 1 seconds

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• Looked at 123 lines of code in 2 files
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1. pkg/query-service/app/traces/v4/query_builder.go:28

• Draft comment:
  Avoid using the component/index.tsx file structure approach, as it makes it difficult to debug and find components using global search tools like VS Code.
• Reason this comment was not posted:
  Comment was not on a valid diff hunk.

Workflow ID: wflow_JbcoJwqxCCdoWqLz

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