Remove pyright-language-service license header changes as they are
already addressed in PR apache#4132. This commit now focuses only on:

- mbknor-jackson-jsonschema (MIT license attribution)
- Angular array.type.ts (MIT license attribution)
- sbt-license-report plugin for dependency tracking

…4134)

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### What changes were proposed in this PR?
The third-party code (all MIT licensed, Category A) is compatible with
Apache License 2.0 but requires proper attribution per Apache policy.
This PR addresses license compliance issues identified during an audit:

MIT License Headers Restored:
- com/kjetland/** - mbknor-jackson-jsonschema (MIT)
- frontend/src/app/common/formly/*.ts - Google Angular examples (MIT)
- pyright-language-service/src/*.ts - TypeFox monaco-languageclient
(MIT)
- Replaced CC-BY 3.0 icons with MIT-licensed alternatives from SVGRepo
- Removed `hub_icon.svg` (which is from Shutterstock using incompatible
license)

LICENSE File:
- Added third-party attribution section grouped by license type
- Added licenses/LICENSE-MIT.txt

Config:
- Updated .licenserc.yaml to exclude third-party files from Apache
header checks

References:
- [Apache licensing-howto: Bundling permissively-licensed
dependencies](https://infra.apache.org/licensing-howto.html#permissive-deps)
- [ASF 3rd Party License
Policy](https://www.apache.org/legal/resolved.html)

### Any related issues, documentation, discussions?
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Closes #4135. Related to #4132.


### How was this PR tested?
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Manual verified.

### Was this PR authored or co-authored using generative AI tooling?
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Co-authored with Claude code.

---------

Co-authored-by: Claude <[email protected]>
Co-authored-by: Chen Li <[email protected]>