fix 🐛: fix regexp for cookie parsing

[gogusarov]

Motivation

Currently used helper does not take into account the parsing of cookies which have empty values (eg "foo=; hello=world") which leads to several problems:

1. sdk not starting due to having a corrupt cookie (cookie is a default session strategy and we check if this strategy is available in areCookiesAuthorized by tryint to set a test cookie value & then read from this cookie; this check will fail if empty cookie goes before the test cookie)
2. sdk reporting incorrect cookie values

Changes

Fixed common utility function, updated corresponding unit test

Test instructions

https://regex101.com/r/3K03iT/1 - buggy behavior
https://regex101.com/r/3K03iT/2 - behavior after fix

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[datadog-prod-us1-3]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 85.71%
• Overall Coverage: 77.01% (-0.00%)

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[mormubis]

Can you make a regression test?

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	179.27 KiB	179.26 KiB	-10 B	-0.01%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	27.03 KiB	27.03 KiB	0 B	0.00%	✅
Logs	56.65 KiB	56.67 KiB	+20 B	+0.03%	✅
Rum Slim	135.11 KiB	135.10 KiB	-12 B	-0.01%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0041	0.0061	+48.78%
RUM - add action	0.0148	0.0175	+18.24%
RUM - add error	0.0147	0.0139	-5.44%
RUM - add timing	0.0029	0.0036	+24.14%
RUM - start view	0.0136	0.0127	-6.62%
RUM - start/stop session replay recording	0.0008	0.0007	-12.50%
Logs - log message	0.0205	0.0177	-13.66%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	31.59 KiB	31.38 KiB	-223 B
RUM - add action	105.36 KiB	98.98 KiB	-6.39 KiB
RUM - add timing	32.19 KiB	32.15 KiB	-40 B
RUM - add error	100.26 KiB	102.42 KiB	+2.17 KiB
RUM - start/stop session replay recording	32.95 KiB	32.75 KiB	-210 B
RUM - start view	497.39 KiB	490.56 KiB	-6.83 KiB
Logs - log message	96.01 KiB	102.35 KiB	+6.34 KiB

🔗 RealWorld

[gogusarov]

I have read the CLA Document and I hereby sign the CLA