Fix deadlock in AccMgrAuthTokenProvider when account is removed during token refresh

[wmathurin]

When logout occurs while threads are refreshing tokens, the method will return for matchingAccount == null and therefore the lock.notifyAll() that is later in the method will never be called causing other threads to be stuck on lock.wait(). Now the try-finally wraps all the logic after gettingAuthToken = true to ensure that lock.notifyAll() is always called.

Fixes W-21304558

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.57%. Comparing base (9e8338d) to head (221431a).
⚠️ Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
.../com/salesforce/androidsdk/rest/ClientManager.java	88.23%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #2846      +/-   ##
============================================
+ Coverage     64.55%   64.57%   +0.02%     
- Complexity     2925     2926       +1     
============================================
  Files           222      222              
  Lines         17323    17338      +15     
  Branches       2471     2474       +3     
============================================
+ Hits          11182    11196      +14     
  Misses         4934     4934              
- Partials       1207     1208       +1     

Components	Coverage Δ
Analytics	47.92% <ø> (ø)
SalesforceSDK	59.08% <84.37%> (+0.05%)	⬆️
Hybrid	59.05% <ø> (ø)
SmartStore	78.20% <ø> (ø)
MobileSync	81.68% <ø> (ø)
React	52.36% <ø> (ø)

Files with missing lines	Coverage Δ
.../com/salesforce/androidsdk/rest/ClientManager.java	62.79% <88.23%> (+0.66%)	⬆️

... and 1 file with indirect coverage changes

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