feat(fe:FSADT1-2094): fix "keyword"-like splitting to check for exact match

[fterra-encora]

Description

Fixes "keyword"-like splitting to check for exact match, which in turn fixes the "no exact match" message being displayed by mistake in the following situations:

• on empty search;
• when search input contains: repeated white-space; or a sequence of two or more non-alphanumerical characters (including white-space), for example: ", ", or " (", or ",(".

Fixes FSADT1-2094

Type of change

• 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 not work as expected)
• This change requires a documentation update
• Documentation update

How Has This Been Tested?

• New unit tests
• New integrated tests
• New component tests
• New end-to-end tests
• New user flow tests
• No new tests are required
• Manual tests (description below)
• Updated existing tests

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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