resolved error caused by calling same promise variable more than one time

[HarshGandhi-AWS]

Motivation

• Please give a brief description for the background of this change.
• Issue number:
• In SharedCrtResourceManager class, we were calling same promise variable more than one time while closing MQTT connection.

Modifications

Change summary

Please describe what changes are included in this pull request.

• Updated the logic to initialize new promise variable every time connection is established.

Revision diff summary

If there is more than one revision, please explain what has been changed since the last revision.

Testing

Is your change tested? If not, please justify the reason.
Please list your testing steps and test results.

• CI test run result:
• Tested manually.

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