fix(typescript-estree): ensure backwards compat with pre-5.3 import attributes

[bradzacher]

PR Checklist

• Addresses an existing open issue: fixes Bug: Unexpected node TSAssertEntry #7960
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

We don't have old TS version regression tests so this is a bit of a "trust me bro".
Manual test steps:

1. checkout branch
2. yarn && yarn build
3. copy folder packages/typescript-estree/dist
4. open a new folder
5. yarn add @typescript-eslint/typescript-estree
6. run node and use the repl from the issue (require('@typescript-eslint/typescript-estree').parse('import json from "./foo.json" assert { type: "json", type: "bar" };').body[0].attributes) --> observe the broken AST is printed.
7. paste the copied dist folder to node_modules/@typescript-eslint/typescript-estree/
8. run node and use the repl from the issue --> observe the correct AST is printed.

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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