refactor: rename regression to delta and benchmark to baseline for perf-tests

[ritwikranjan]

Description

This pull request involves renaming variables and types related to performance testing to improve clarity and consistency. The changes primarily focus on replacing the term "regression" with "delta" and "benchmark" with "baseline" across various files and functions.

Key changes include:

Variable Renaming:

• test/e2e/jobs/perf.go: Renamed benchmarkFile to baselineFile and regressionFile to deltaFile. Updated corresponding references in the RunPerfTest function. [1] [2]

Type and Function Renaming:

• test/e2e/scenarios/perf/get-perf-regression-results.go: Renamed RegressionResult to DeltaResult, GetNetworkRegressionResults to GetNetworkDeltaResults, and updated all related variable names and function calls accordingly. [1] [2] [3] [4]

Functionality Updates:

• test/e2e/scenarios/perf/publish-perf-results.go: Updated to use DeltaResult instead of RegressionResult and renamed variables to reflect the new terminology. [1] [2]

Related Issue

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Checklist

• I have read the contributing documentation.
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• I have updated the documentation, if necessary.
• I have added tests, if applicable.

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[SRodi]

LGTM