fix: (Core) remove DIALOG_CONFIG and DIALOG_REF and make DialogConfig and DialogRef injectable

[InnaAtanasova]

Please provide a link to the associated issue.

Closes #3903

Please provide a brief summary of this pull request.

BREAKING CHANGE:
removed DIALOG_CONFIG and DIALOG_REF and made DialogConfig and DialogRef classes injectable

Before:

constructor(
    @Inject(DIALOG_CONFIG) public dialogConfig: DialogConfig,
    @Inject(DIALOG_REF) private _dialogRef: DialogRef
)

Now:

constructor(
    public dialogConfig: DialogConfig,
    private _dialogRef: DialogRef
)

Please check whether the PR fulfills the following requirements

• the commit message follows the guideline:
  https://github.com/SAP/fundamental-ngx/blob/master/CONTRIBUTING.md
• tests for the changes that have been done
• all items on the PR Review Checklist are addressed :
  https://github.com/SAP/fundamental-ngx/wiki/PR-Review-Checklist

Documentation checklist:

• [na] update README.md
• Breaking Changes Wiki
• Documentation Examples
• Stackblitz works for all examples

[netlify]

✔️ Deploy preview for fundamental-ngx ready!

🔨 Explore the source changes: 7d4a6ac

🔍 Inspect the deploy logs: https://app.netlify.com/sites/fundamental-ngx/deploys/5fd8c15a8469770008304ec2

😎 Browse the preview: https://deploy-preview-4108--fundamental-ngx.netlify.app

[salarenko]

Looks good! I don't remember what we agreed on, but this PR removes the injection tokens, so users will be forced to abandon them as well. This is a simple transition, so I think that's ok.

[JKMarkowski]

LGTM