fix: do not apply custom name for instanceToPlain on toClassOnly and exposeAll

[diffy0712]

Description

The following code do not run as expected with 'exposeAll' strategy.

class User {
  @Expose({ name: 'pass', toClassOnly: true })
  password: string;
}

const user = new User();
user.password = 'StrongPassword'

const plainedUser = instanceToPlain(user, {strategy: 'exposeAll'});
expect(plainedUser).toEqual({
  password: 'StrongPassword',
});
/**
 * Fails
 * 
 * - Expected  - 1
 * + Received  + 1
 *
 *   Object {
 * -   "password": "StrongPassword",
 * +   "pass": "StrongPassword",
 *   }
 */

Checklist

• [x] the pull request title describes what this PR does (not a vague title like Update index.md)
• [x] the pull request targets the default branch of the repository (develop)
• [x] the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• [x] tests are added for the changes I made (if any source code was modified)
• [ ] documentation added or updated
• [x] I have run the project locally and verified that there are no errors

Fixes

fixes https://github.com/typestack/class-transformer/issues/1324

[jfelicianiats]

@diffy0712 Hey thanks so much for the PR on this issue! Quick question though as I'm not familiar with this project on releases. When this gets merged, is there an estimate to when this will be released to a public npm version? It doesn't look like any releases have happened in a long time... or is there some other process now there?

[diffy0712]

@jfelicianiats, Unfortunately, I cannot give an estimate on when this will be merged and released. Hopefully soon. I think you can follow this pr and get notified if anything happens.