feat(CALC-3) - Enable multiplication (*) operation in the calculator.

[yurysasim-hub]

What does this PR do?

It enables the previously disabled multiplication button on the UI and handles the calculation.

Ticket number?

CALC-3

Please make sure:

• I have checked that my code builds clean without any errors or warnings
• I have checked that all AC are passed
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes
• I have made corresponding changes to the documentation

Does This Introduce a Breaking Change?

• Yes
• No

⚠️ Note: Only one option must be checked.
If this introduces a breaking change, please describe the impact and migration path for existing applications below.

Other Information or Known Dependencies

• Use this section to attach pictures that demonstrates your changes working / healthy
• Any other information or known dependencies that is important to this PR.
• TODO that are to be done after this PR.

---

All checkboxes must be checked by devs or provided information why not.