[ES|QL] hides popup for operators in the editor

[momovdg]

resolves #248391

Summary

This fixe stops the signature popup from appearing when hovering over operators.

Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
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[elasticmachine]

Pinging @elastic/kibana-esql (Team:ESQL)

[stratoula]

Thanks for the PR, I have some second thoughts. I think it is confusing that we dont allow the hover at the != etc but we allow it for isNULL

Why don't we hide the hover only for the SET = and nothing else? It seems everything else is quite decent. Wdyt?

[stratoula]

You could combine them

  const operators = [
    '=',
    ...[...arithmeticOperators, ...comparisonFunctions].map(({ name }) => name),
  ]

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 43741d3

Failed CI Steps

• FTR Configs #41
• FTR Configs #86

Test Failures

• [job] [logs] FTR Configs #41 / "before all" hook in "{root}"
• [job] [logs] FTR Configs #86 / "before all" hook in "{root}"

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
kbnUiSharedDeps-srcJs	4.5MB	4.5MB	+16.0B

cc @momovdg