v1.2.0 STDDEV changes and display tweaks

STDDEV in GMT is now exclusively calculated as SAMPLE-STDDEV and not POP-STDDEV anymore.

This is for two reasons:

• It is required by certifications like the Blue Angel for Software
• We got many debates that in cases where the average is only estimated through measurements and is not absolute one MUST use the sample STDDEV. Still one could argue that one does not want to characterize the measured software but rather the measurement setup it is safer to use the sample STDDEV as it is always higher

Furthermore some display changed where made to have the AVG bar optional and quick-access for the timeline was added on overview

What's Changed

• Toggle for AVG in Timeline Charts by @ArneTR in #940
• Sample stddev by @ArneTR in #941
• (feature): Print CSS styles for frontend [skip ci] by @ArneTR in #942
• Test fixes by @ArneTR in #943
• Bump uvicorn[standard] from 0.31.0 to 0.31.1 by @dependabot in #944
• Bump aiohttp from 3.10.9 to 3.10.10 by @dependabot in #946
• Quick Access for timeline added by @ArneTR in #947
• Making Workload Validation also accept absolute values by @ArneTR in #948
• Bump fastapi[standard] from 0.115.0 to 0.115.2 by @dependabot in #950

Full Changelog: v1.1.1...v1.1.2