Add SugarCrm sync priority for form push

[Enc3phale]

Please be sure you are submitting this against the staging branch.

Q	A
Bug fix?	Y
New feature?	Y
Automated tests included?	N
Related user documentation PR URL	N
Related developer documentation PR URL	N
Issues addressed (#s or URLs)	N
BC breaks?	N
Deprecations?	N

Description:

Add SugarCRM priority sync when data is sync with form action.
Fix some warning like:

Warning: Invalid argument supplied for foreach() in \plugins\MauticCrmBundle\Integration\SugarcrmIntegration.php on line 1505

Notice: Undefined index: Leads in \plugins\MauticCrmBundle\Integration\SugarcrmIntegration.php on line 1344

PHP Warning:  array_keys() expects parameter 1 to be array, null given in \plugins\MauticCrmBundle\Integration\SugarcrmIntegration.php on line 1466

Warning: Invalid argument supplied for foreach() in \plugins\MauticCrmBundle\Integration\SugarcrmIntegration.php on line 1347

Steps to reproduce the bug:

1. Install and configure SugarCRM
2. Map fields for Contact
3. Put First Name for Contact on Mautic priority
4. Create a contact with an Email a First Name and a Mobile phone in SugarCrm
5. Run sync with command mautic:integration:fetchleads
6. Create a standalone form with Email field, First Name field and a Mobile phone field
7. Add form action "Push contact to integration" and choose "SugarCrm"
8. Go to this form in private navigation and submit it with Email of previous created Lead but use an other First Name and an other Mobile phone.
9. First Name and Mobile phone is pushed to SugarCrm without check of priority

Steps to test this PR:

1. Load up this PR
2. Repeat step above
3. Only First Name is pushed to SugarCrm.

[npracht]

Used in production environment with success for weeks now 👍