[BREAK] Migrate current priorities endpoints to SLAs

[cauefcr]

Proposed changes (including videos or screenshots)

'/v1/livechat/priorities': {
    GET: (params: LivechatPrioritiesProps) => PaginatedResult<{ priorities: ILivechatPriority[] }>;
};

'/v1/livechat/priorities/:priorityId': {
    GET: () => ILivechatPriority;
};

becomes

'/v1/livechat/sla': {
    GET: (params: LivechatPrioritiesProps) => PaginatedResult<{ sla: IOmnichannelServiceLevelAgreements[] }>;
};

'/v1/livechat/sla/:slaId': {
    GET: () => IOmnichannelServiceLevelAgreements;
};

and the new priority endpoints are:

'/v1/livechat/priorities': {
    GET: (params: LivechatPrioritiesProps) => PaginatedResult<{ priorities: ILivechatPriority[] }>;
};

'/v1/livechat/priority/:priorityId': {
    GET: () => ILivechatPriority | void;
};

'/v1/livechat/priority': {
    POST: (params: ILivechatPriorityData) => ILivechatPriority | void;
};

Name changes, migration and deprecation of old name, as it'll be used in the future, similar changes done to functions, models, tests and types.

Issue(s)

Steps to test or reproduce

Further comments

OC-291
OC-292
OC-293
OC-294
OC-390

[KevLehman]

Can you link which PRs this has included? So we can close the other ones to avoid conflicts 👀 .

(Apart from that, everything looks fine i think )

[cauefcr]

based on this PR #27093

too many changes after approval

[codecov]

Codecov Report

Merging #27104 (b2501e2) into feature/omnichannel-priorities (80fcc59) will increase coverage by 0.03%.
The diff coverage is 33.33%.

@@                        Coverage Diff                         @@
##           feature/omnichannel-priorities   #27104      +/-   ##
==================================================================
+ Coverage                           40.98%   41.02%   +0.03%     
==================================================================
  Files                                 802      802              
  Lines                               17819    17810       -9     
  Branches                             1972     1961      -11     
==================================================================
+ Hits                                 7304     7307       +3     
+ Misses                              10223    10208      -15     
- Partials                              292      295       +3     

Flag	Coverage Δ
e2e	41.02% <33.33%> (+0.03%)	⬆️

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