Fix terminate chain method

[Phanco]

What was the problem?

This PR resolves #8603

How was it solved?

Use .has to check terminatedAccount

How was it tested?

Unit tests updated

[sitetester]

Bonus point:

{
	get: jest.fn(),
	set: jest.fn(),
	has: jest.fn(),
};

These repeated mocking calls don't look so nice on page, so can replace with getStoreMock() like this

const getStoreMock = () => ({
	get: jest.fn(),
	set: jest.fn(),
	has: jest.fn(),
});
const chainAccountStoreMock = getStoreMock(); // Example change

[sitetester]

Feedback submitted

[codecov]

Codecov Report

Merging #8740 (3afd481) into release/6.0.0 (e816bf8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 3afd481 differs from pull request most recent head 6f45c14. Consider uploading reports for the commit 6f45c14 to get more accurate results

Additional details and impacted files

@@              Coverage Diff               @@
##           release/6.0.0    #8740   +/-   ##
==============================================
  Coverage          83.30%   83.30%           
==============================================
  Files                593      593           
  Lines              22282    22294   +12     
  Branches            3288     3292    +4     
==============================================
+ Hits               18561    18572   +11     
- Misses              3721     3722    +1     

Impacted Files	Coverage Δ
...s/interoperability/base_interoperability_method.ts	100.00% <100.00%> (ø)

... and 6 files with indirect coverage changes