[WiFiScan] Fix clear 'scanning bit' and clear scanCount

[TD-er]

WIFI_SCANNING_BIT may not always be cleared on timeout. Also _scanCount will only be cleared if there is a _scanResult.

See: #8952

N.B. this is a summary of discussion with @me-no-dev
Still a draft

[github-actions]

Warnings

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[github-actions]

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
ESP32P4	0	⚠️ +6	0.00	0.00	0	0	0.00	0.00
ESP32S3	0	0	0.00	0.00	0	0	0.00	0.00
ESP32S2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32C3	0	⚠️ +6	0.00	0.00	0	0	0.00	0.00
ESP32C6	0	⚠️ +6	0.00	0.00	0	0	0.00	0.00
ESP32	0	0	0.00	0.00	0	0	0.00	0.00

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

Target	ESP32P4		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
WiFi/examples/FTM/FTM_Initiator	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/FTM/FTM_Responder	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/SimpleWiFiServer	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiAccessPoint	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiClient	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiClientBasic	⚠️ +6	0	0	0	0	0	⚠️ +6	0	⚠️ +6	0	0	0
WiFi/examples/WiFiClientConnect	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiClientEvents	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiClientStaticIP	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiExtender	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiIPv6	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiMulti	⚠️ +6	0	0	0	0	0	⚠️ +6	0	⚠️ +6	0	0	0
WiFi/examples/WiFiMultiAdvanced	⚠️ +6	0	0	0	0	0	⚠️ +6	0	⚠️ +6	0	0	0
WiFi/examples/WiFiScan	⚠️ +4	0	0	0	0	0	⚠️ +4	0	⚠️ +4	0	0	0
WiFi/examples/WiFiScanAsync	⚠️ +4	0	0	0	0	0	⚠️ +4	0	⚠️ +4	0	0	0
WiFi/examples/WiFiScanDualAntenna	⚠️ +4	0	0	0	0	0	⚠️ +6	0	⚠️ +4	0	0	0
WiFi/examples/WiFiScanTime	⚠️ +6	0	0	0	0	0	⚠️ +4	0	⚠️ +6	0	0	0
WiFi/examples/WiFiTelnetToSerial	⚠️ +6	0	0	0	0	0	⚠️ +6	0	⚠️ +6	0	0	0
WiFi/examples/WiFiUDPClient	0	0	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WPS	-	-	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiBlueToothSwitch	-	-	0	0	-	-	0	0	0	0	0	0
WiFi/examples/WiFiClientEnterprise	-	-	0	0	0	0	0	0	0	0	0	0
WiFi/examples/WiFiSmartConfig	-	-	0	0	0	0	0	0	0	0	0	0

[github-actions]

Test Results

 76 files   76 suites   14m 39s ⏱️
 38 tests  38 ✅ 0 💤 0 ❌
241 runs  241 ✅ 0 💤 0 ❌

Results for commit 49a45cc.

[me-no-dev]

Closing in favor of #11188