Fix a problem that 3rd-party plugins could not be loaded with legacy config

[mizdra]

close: #364

[mizdra]

I was expecting only one disable comment to be added, but multiple ones were added.

To investigate this problem, I added the following code for the debug log.

• 33de5de

$ pnpm run test -t "fixes problems" src/core.test.ts
...
unfilteredMessages [
  {
    ruleId: 'test/ban-nullish-coalescing-operator',
    message: "Definition for rule 'test/ban-nullish-coalescing-operator' was not found.",
    line: 1,
    column: 1,
    endLine: 1,
    endColumn: 2,
    severity: 2,
    nodeType: null
  }
]

It seems that the plugin is failing to load.

[mizdra]

core.lint() only uses the ESLint class. On the other hand, core.disablePerLine() uses both the ESLint class and the Linter class.

The ESLint class seems to be able to load 3rd-party plugins, but the Linter class cannot.

As a result, it seems that although the lint results can be output, the problems cannot be fixed.