Add whitespace validation

[MadLamprey]

Summary:

Fixes #1217

Changes Made:

• Created validator noWhitespace
• Updated HTML to display error message relating to noWhitespace validation

Proposed Commit Message:

Add validation for title containing only whitespaces

An error message is displayed when user enters only whitespaces but does not provide sufficient information or remedy.

Updating the error message to clearly indicate the problem enhances the user experience.

Let's create a noWhitespace validator to check for title containing only whitespaces.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (013fbfa) 53.86% compared to head (478b7d1) 53.82%.

Files	Patch %	Lines
src/app/core/validators/noWhitespace.validator.ts	50.00%	1 Missing and 1 partial :warning:
...ase-bug-reporting/new-issue/new-issue.component.ts	50.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1237 +/- ## ========================================== - Coverage 53.86% 53.82% -0.04% ========================================== Files 101 102 +1 Lines 2885 2889 +4 Branches 534 535 +1 ========================================== + Hits 1554 1555 +1 - Misses 988 989 +1 - Partials 343 345 +2 ```

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