Remove quarantined es5-ext dependency

[jiridanek]

Summary

• Remove the direct es5-ext@0.10.64 dependency from ts/src/connections/package.json — it is an ES5 polyfill unnecessary for modern Node.js targets (connor4312 noted this in TS SDK depends on a vulnerable version of es5-ext #420).
• Add npm override to alias the remaining transitive es5-ext (from websocket@^1.0.28) to @unes/es5-ext@0.10.64-1, a community fork without the postinstall script.
• es5-ext is quarantined by Nexus Firewall (sonatype-2022-2248) due to undisclosed postinstall code execution, blocking hardened supply chain builds.

Ref: #420

References

• medikoo/es5-ext#186 — upstream protestware discussion
• microsoft/vscode#310541 — downstream impact on VS Code
• theturtle32/WebSocket-Node#473 — upstream websocket package dropping es5-ext

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