tools: auto fix custom eslint rule for prefer-assert-methods.js

[shobhitchittora]

This adds eslint fixer for auto-fixing the usage of assert operators. Also adding fileoverview for the perfer-assert-methods.js file.

For example the fixer change this assert(obj.value !== 9); to assert.notStrictEqual(obj.value, 9);

Refs: #16636

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines
• modify tests

Affected core subsystem(s)

Tools