fix(sdk): improve delete() method for MutJson class

[partha04patel]

Checklist

• [x] Title matches Winglang's style guide
• [x] Description explains motivation and solution
• [x] Tests added (always)
• [ ] Docs updated (only required for features)
• [ ] Added pr/e2e-full label if this feature requires end-to-end testing

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Topic	Owner
Wing SDK and utility APIs	@chriscbr
Wing Console	@ainvoner, @skyrpex, @polamoros
JSON, structs, primitives and collections	@hasanaburayyan
Platforms and plugins	@hasanaburayyan
Frontend resources (website, react, etc)	@tsuf239
Language design	@chriscbr
VSCode extension and language server	@markmcculloh
Compiler architecture, inflights, lifting	@yoav-steinberg
Wing Testing Framework	@tsuf239
Wing CLI	@markmcculloh
Build system, dev environment, releases	@markmcculloh
Library Ecosystem	@chriscbr
Documentation	@hasanaburayyan
SDK test suite	@tsuf239
Examples	@hasanaburayyan
Wing Playground	@eladcon

[partha04patel]

Intended for having delete() work for non-map MutJson instances as brought up by @Chriscbr and @MarkMcCulloh from https://github.com/winglang/wing/pull/6236

[revitalbarletz]

@partha04patel do you need any additional help here? seems like we are almost done!

[github-actions[bot]]

Hi,

This PR has not seen activity in 20 days. Therefore, we are marking the PR as stale for now. It will be closed after 7 days. If you need help with the PR, do not hesitate to reach out in the winglang community Discord. Feel free to re-open this PR when it is still relevant and ready to be worked on again. Thanks!