fix(update): Check that there is a free OTA partition before writing

[lbernstone]

Description of Change

Added a check to see that next OTA partition is not the running partition. Writing to the active partition causes an immediate crash.

Test Scenarios

Tested on an ESP32, but should be quite universal

Related links

Brought up in #12252, but that user is not expecting a fix.

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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32	0	⚠️ +16	0.00	0.00	0	0	0.00	0.00
ESP32C3	0	⚠️ +16	0.00	0.00	0	0	0.00	0.00
ESP32C5	0	⚠️ +16	0.00	0.00	0	0	0.00	0.00
ESP32C6	0	⚠️ +16	0.00	0.00	0	0	0.00	0.00
ESP32H2	0	⚠️ +16	0.00	0.00	0	0	0.00	0.00
ESP32P4	0	⚠️ +18	0.00	0.00	0	0	0.00	0.00
ESP32S2	0	⚠️ +20	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32S3	0	⚠️ +20	0.00	0.00	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32		ESP32C3		ESP32C5		ESP32C6		ESP32H2		ESP32P4		ESP32S2		ESP32S3
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
libraries/ArduinoOTA/examples/BasicOTA	⚠️ +12	0	⚠️ +16	0	⚠️ +16	0	⚠️ +16	0	-	-	⚠️ +16	0	⚠️ +16	0	⚠️ +20	0
libraries/ArduinoOTA/examples/SignedOTA	⚠️ +16	0	⚠️ +14	0	⚠️ +14	0	⚠️ +14	0	-	-	⚠️ +14	0	⚠️ +12	0	⚠️ +12	0
libraries/HTTPUpdate/examples/httpUpdate	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/HTTPUpdate/examples/httpUpdateSPIFFS	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/HTTPUpdate/examples/httpUpdateSecure	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	0	0	-	-
libraries/HTTPUpdateServer/examples/WebUpdater	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/Update/examples/AWS_S3_OTA_Update	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/Update/examples/HTTP_Client_AES_OTA_Update	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/Update/examples/HTTP_Server_AES_OTA_Update	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/Update/examples/OTAWebUpdater	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/Update/examples/SD_Update	⚠️ +16	0	⚠️ +16	0	-	-	-	-	⚠️ +16	0	⚠️ +18	0	⚠️ +20	0	-	-
libraries/Update/examples/Signed_OTA_Update	⚠️ +16	0	⚠️ +12	0	-	-	-	-	-	-	⚠️ +12	0	⚠️ +12	0	-	-
libraries/WebServer/examples/HttpAdvancedAuth	⚠️ +16	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/WebServer/examples/HttpAuthCallback	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/WebServer/examples/HttpAuthCallbackInline	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +20	0	-	-
libraries/WebServer/examples/HttpBasicAuth	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/WebServer/examples/HttpBasicAuthSHA1	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/WebServer/examples/HttpBasicAuthSHA1orBearerToken	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-
libraries/WebServer/examples/WebUpdate	⚠️ +12	0	⚠️ +16	0	-	-	-	-	-	-	⚠️ +16	0	⚠️ +16	0	-	-

[github-actions]

Test Results

 90 files   90 suites   31m 49s ⏱️
 67 tests  67 ✅ 0 💤 0 ❌
683 runs  683 ✅ 0 💤 0 ❌

Results for commit bc54f3fd.

♻️ This comment has been updated with latest results.