[BUGFIX] OBC SPI Driver - bus owner check (#266)

# Purpose
- Bug fix for checking if the current task is the mutex holder
- EDIT: [Link to notion
ticket](https://www.notion.so/uworbital/BUG-Fix-OBC-SPI-driver-50ed1a38fbfa441fab73eb4e53031da8?pvs=4)

# New Changes
- Updated mutex check to work without the task having to acquire the
mutex
- Get the mutex holder task handle, get the current task handle and
compare the two

# Testing
- Tested build
- Wrote test tasks and verified behaviours. Test task pushed to new test
branch
[here](4262284#diff-2274f55664008bf88953e91bf95c1d2c00f9a207f0ad7d21d18b8240e808340e)
- Test serial output:
```Testing isSpiBusOwner...
Acquired mutex
PASS: isSpiBusOwner returned TRUE after acquiring mutex
Releasing mutex...
Released mutex
PASS: isSpiBusOwner returned FALSE after releasing mutex
PASSED isSpiBusOwner Test!
```

# Outstanding Changes
- NA

EDIT 2025-03-01: Added more change details, on-board testing

---------

Co-authored-by: Navtajhundal <87790825+Navtajh04@users.noreply.github.com>
Co-authored-by: Yarik Popov <89220488+Yarik-Popov@users.noreply.github.com>

Author: 3 people

obc/app/drivers/rm46/obc_spi_io.c

@@ -248,11 +248,10 @@ static void spiLogErrors(uint32_t spiErr) {
 }
 
 bool isSpiBusOwner(SemaphoreHandle_t spiMutex) {
-  portENTER_CRITICAL();
   TaskHandle_t owner = xSemaphoreGetMutexHolder(spiMutex);
-  portEXIT_CRITICAL();
+  TaskHandle_t currentTask = xTaskGetCurrentTaskHandle();
 
-  return xSemaphoreGetMutexHolder(spiMutex) == owner;
+  return currentTask == owner;
 }
 
 obc_error_code_t getSpiMutex(spiBASE_t *spi, SemaphoreHandle_t *mutex) {