remove garbage: these try/catch tests don't actually test the section cited (or anything for that matter)

Cited: https://www.ecma-international.org/ecma-262/5.1/index.html#sec-12.14.1

Present: https://tc39.github.io/ecma262/#sec-strict-mode-of-ecmascript

> It is a SyntaxError if a CatchParameter occurs within strict mode code and BoundNames of CatchParameter contains either eval or arguments (13.15.1).

Promise.prototype.finally: add tests

Proxy ownKeys should throw a TypeError if returned keys are not String or Symbol. Fixes gh-1169 (#1173)

Proxy, [[OwnPropertyKeys]]: If trapResult contains any duplicate entries, throw a TypeError

See https://github.com/tc39/ecma262/pull/858.

Ref: https://github.com/tc39/ecma262/pull/833

Remove selection of incorrect async iteration tests. Fixes gh-1154

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

```
$ python tools/lint/lint.py --whitelist lint.whitelist harness/*.js
Linting 25 files.
Linting complete. 0 errors found.
```

- Renames detachArrayBuffer-$262.detachArrayBuffer.js -> detachArrayBuffer-host-detachArrayBuffer.js (previous naming prevents command-click from terminal)

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Revert "Add initial set of class field tests (from V8's test-parsing.cc)"

This reverts commit e731114c.

This reverts commit 5326cc5d.

See e731114c

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

At this point this requires Babel for testing, but most tests in this
commit won't pass until this is fixed:
https://github.com/babel/babel/issues/5056

The `throw` statements that were recently inserted into these tests have
an observable impact on the parsing behavior: they causes the `"use
strict"` token sequence to be interpreted as a string literal instead of
a directive prolog, which in turn effects how the tests are interpreted.

Remove the new `throw` statements from these tests and rely on
previously-existing statements that serve the same purpose without
impacting program strictness.