Read File Sync with proper require

[Martin-Zeithaml]

Proposed changes

The message ZWED0159E - Could not read zowe manifest, version unknown is generated due to wrong require function:

      let contents = fsPromises.readFileSync(path.join(zoweConfig.zowe.runtimeDirectory, 'manifest.json'), {encoding: 'utf8'});  
                                ^                                                                   
TypeError: fsPromises.readFileSync is not a function                                                

Fixes:

• Critical error ZWED0159E with normal Zowe run zlux#983
• Partially:
  • Issue bringing up zowe on external domain.  community#2135
  • After installing v2.12 the Zowe task issues CEE3608I and ZWED0159E messages zowe-install-packaging#3656

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

PR Checklist

Please delete options that are not relevant.

• If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• My code follows the style guidelines of this project (see: Contributing guideline)
• Relevant update to CHANGELOG.md
• My changes generate no new warnings

Testing

No ZWED0159E with fix.

CHANGELOG: The message "ZWED0159E - Could not read zowe manifest, version unknown" is no longer printed always
VERSION 2.16.0