fix(setVersion.sh): support pre-release version formats (e.g. 14.0.0-rc.0)

[wmathurin]

Summary

Strip the pre-release suffix before computing the C preprocessor macro name and value in update_salesforce_sdk_constants. For 14.0.0-rc.0, the old code produced __SALESFORCE_SDK_14_0_0-rc_0 (invalid C identifier — hyphen is not allowed in macro names) and 14000-rc00 (not a valid integer). The fix derives both from base_version=${version%%-*} so the macro is always a valid C identifier.

GUS: W-23916129

Test plan

• ./setVersion.sh -v 14.0.0-rc.0 completes without error; generated header contains valid #define __SALESFORCE_SDK_14_0_0 140000
• ./setVersion.sh -v 14.0.0 continues to work as before (no regression)

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^18 Test Results	979 ran	978 ✅		1 ❌

Test	Result
SalesforceSDKCore iOS ^18 Test Results
SalesforceRestAPITests.testUpdateSeenNotifications	❌ failure

[github-actions]

	Tests	Passed	Skipped	Failed ❌️
AuthFlowTester UI Test Results all	1 ran			1 ❌

Test	Result
AuthFlowTester UI Test Results all
AuthFlowTesterUITests.xctest
LegacyLoginTests.testCAOpaque_DefaultScopes_WebServerFlow()	❌ failure

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.04%. Comparing base (1c71899) to head (aabbbc5).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4137      +/-   ##
==========================================
- Coverage   64.77%   58.04%   -6.74%     
==========================================
  Files         195      195              
  Lines       16671    16671              
==========================================
- Hits        10799     9677    -1122     
- Misses       5872     6994    +1122     

Components	Coverage Δ
Analytics	40.98% <ø> (-2.36%)	⬇️
Common	57.48% <ø> (-0.19%)	⬇️
Core	58.58% <ø> (-7.36%)	⬇️
SmartStore	∅ <ø> (∅)
MobileSync	∅ <ø> (∅)
see 41 files with indirect coverage changes

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[sfdctaka]

LGTM!