Fixed soft button operation never finishing if template does not support soft buttons

[NicoleYarroch]

Fixes #1474

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).

Unit Tests

• Added unit tests to the SDLSoftButtonReplaceOperationSpec to check if the operation finishes as expected.

Core Tests

• This can not be easily tested with generic_hmi due to an existing bug: Incorrect display capabilities returned when setting the LARGE_GRAPHIC_ONLY template generic_hmi#228. Also, since sdl_hmi only supports 1 template, this can not be tested with sdl_hmi.

Reproduction Steps

1. Send a LARGE_GRAPHIC_WITH_SOFTBUTTONS template and use the screen manager to send 8 soft buttons when the template has been set successfully.
2. Send a LARGE_GRAPHIC_ONLY template and use the screen manager to send 8 new soft buttons when the template has been set successfully. To reproduce the bug, set a break point in the SDLSoftButtonManager's sdl_displayCapabilityDidUpdate: and manually set the SDLSoftButtonReplaceOperation's capabilities to nil in the console.
3. Send a LARGE_GRAPHIC_WITH_SOFTBUTTONS template and use the screen manager to send 8 new soft buttons when the template has been set successfully. The new buttons will not be sent.

Core version / branch / commit hash / module tested against: sdl_core, commit 4d283e625dfa09d166d572fa7bf6e98e91f05050 (tag: 6.0.0_RC2, origin/release/6.0.0, release/6.0.0)

HMI name / version / branch / commit hash / module tested against: generic_hmi, commit 8fd46298ec636896add85afbea78c550d79fd2b0 (HEAD -> develop, tag: 0.7.0-RC, origin/release/0.7.0)

Summary

Fixed an issue with the soft button transactionQueue freezing when a newly set template does not support soft buttons. This was due to the operation not being finished after sending the text only soft buttons successfully.

Changelog

Bug Fixes

• Fixed the soft button replace operation never finishing if newly set template does not support soft buttons.

CLA

• I have signed the CLA