fix subgrouping not working in CEL filters

[avinal]

Changes

• CEL to SQL interpreter was not respecting subgroups given in CEL expression
• this commit fixes the subgrouping by containing unary and binary operators in parentheses
• fixes #620

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Release Notes

fix subgroups not working in CEL filtering

[avinal]

/kind bug /ok-to-test

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/api/server/cel2sql/interpreter.go	73.3%	74.0%	0.7

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/api/server/cel2sql/interpreter.go	73.3%	74.0%	0.7

[khrm]

/retest-required

[avinal]

I was discussing with Sayan about adding more random tests to the cel2sql interpreter. We may look for a fuzzing test. Let's discuss this on WG call.

[alan-ghelardi]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alan-ghelardi

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[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/api/server/cel2sql/interpreter.go	73.3%	74.0%	0.7