test: add test cases for recursion detection

[KUNDAN1334]

Description

This PR adds test cases for recursion detection in jsonFieldToSchema as requested in #1242.

The existing tests in library/src/helpers/__tests__/schema.test.ts covered basic transformations but had no coverage for recursion scenarios introduced in #1101 and #1241.

Test cases added inside describe('.jsonToSchema'):

• True circular reference (direct) — object references itself → should throw
• True circular reference (via array) — array contains itself → should throw
• True circular reference (indirect) — A → B → A → should throw
• Same object in two sibling branches → should NOT throw (false-positive fixed in fix: recursion detection to allow same resolved $ref in different branches #1241)
• Same object in multiple array positions → should NOT throw (false-positive fixed in fix: recursion detection to allow same resolved $ref in different branches #1241)
• Deep nesting without circularity → should resolve successfully
• Object containing null values → should not throw
• Object containing undefined values → should not throw
• Stateless between calls — usable after a recursion error is thrown

Related issue(s)

Closes #1242

Note: The tests should NOT throw when the same object is referenced in two sibling branches and should NOT throw when the same object appears in multiple array positions are expected to fail on current master until #1241 is merged. They are intentionally written to validate the fix introduced in #1241.

[catosaurusrex2003]

@KUNDAN1334 nice work, the tests are passing now,
It is failing on Linting tho.
Could you please fix those issues when you get a chance?

[KUNDAN1334]

@catosaurusrex2003 Thanks for the review! I'll fix the linting issues shortly.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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