[MOB-16019] Set pending state before updating IdentityMap

[addb]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #57 (0b13899) into dev (a9971d7) will increase coverage by 0.33%.
The diff coverage is 92.86%.

@@            Coverage Diff             @@
##              dev      #57      +/-   ##
==========================================
+ Coverage   94.74%   95.07%   +0.33%     
==========================================
  Files           6        6              
  Lines         304      304              
==========================================
+ Hits          288      289       +1     
+ Misses         16       15       -1     

[kevinlind]

We should also add a pending state when resetIdentifiers is called as well as it updates the Identity Map and generates a new ECID.