Add unit tests for parsing BDX URI

[todo]

connectedhomeip/src/app/clusters/ota-requestor/BDXDownloader.cpp

Lines 220 to 230 in a3127d8

	// TODO: Add unit tests for parsing BDX URI
	CHIP_ERROR BDXDownloader::ParseBdxUri(CharSpan uri, NodeId & nodeId, MutableCharSpan fileDesignator)
	{
	// Check against minimum length of a valid BDX URI
	if (uri.size() < kValidBdxUriMinLen)
	{
	return CHIP_ERROR_INVALID_STRING_LENGTH;
	}
	uint8_t readValue[kUriMaxLen];
	Encoding::LittleEndian::Reader uriReader(reinterpret_cast<const uint8_t *>(uri.data()), uri.size());

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This issue was generated by todo based on a TODO comment in a3127d8 when #12636 was merged. cc @carol-apple.

[carol-apple]

Fixed by: #12784