fix(isolated-declarations): private accessors keep their types

[CPunisher]

Input:

export class Cls {
  accessor d: string;
  private accessor e: string;
  private static accessor f: string;
}

Expected:

export declare class Cls {
    accessor d: string;
    private accessor e;
    private static accessor f;
}

Actual:

export declare class Cls {
    accessor d: string;
    private accessor e: string;
    private static accessor f: string;
}

ts playground: https://www.typescriptlang.org/play/?#code/MYGwhgzhAEDCIwN4ChrTMYBTKB7ATtACYBc0EALvgJYB2A5gNyrQAONAbmBVupjhALQsZSjQbM07alx7kK3asD7Y8hAGaiqdJsgC+yZEA

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #9132 will not alter performance

_{Comparing CPunisher:02-14-fix/isolated-private-auto-accessor (b2194e0) with main (0715e34)}

Summary

✅ 33 untouched benchmarks

[Dunqing]

LGTM!