@W-22369351: Mark null_value in Pulse filter schema as nullable

[anyoung-tableau]

I was testing the list-all-pulse-metric-definitions tool against the techandprod site today and got a schema validation error.

requestId: 7, error: Zodios: Invalid response from endpoint 'get /pulse/definitions'
status: 200 OK
cause:
[
  {
    "code": "invalid_type",
    "expected": "string",
    "received": "null",
    "path": [
      "definitions",
      217,
      "specification",
      "basic_specification",
      "filters",
      0,
      "categorical_values",
      0,
      "null_value"
    ]
...

[Copilot]

Pull request overview

This PR updates the Pulse types Zod schema to correctly accept null for null_value in categorical filter values, matching observed Tableau Pulse API responses and preventing runtime schema validation failures in tools like list-all-pulse-metric-definitions.

Changes:

• Mark null_value in the Pulse filter schema as nullable (while remaining optional).
• Bump package version from 1.18.9 to 1.18.10 (and align lockfile).

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/sdks/tableau/types/pulse.ts	Adjusts Pulse filter schema to allow null for null_value in API responses.
package.json	Increments package version to 1.18.10.
package-lock.json	Updates lockfile version fields to 1.18.10.

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