Feature/issue 1597

[DDeviak]

Ticket

• Main GitHub issue
• This PR also fixes issue-1599

Summary of change

• Added unified uniqueness validator to use in forms.
• Fixed messages on items editing.

Such logic was implemented in modals on Categories, Tags, Contexts and Positions pages:

• Check for title uniqueness.
• Prevent user from typing more than one whitespace continuously.
• Trim trailing whitespaces on title save and validation.

CHECK LIST

• СI passed
• Сode coverage >=80%
• PR is reviewed manually
• All reviewers agreed to merge the PR
• PR meets all conventions

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
15.9% Coverage on New Code (required ≥ 80%)
9.5% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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