refactor: lowercase algorithm names for Exareme2

...hield/handlers/algorithms/error-algorithm.handler.spec.ts

api/src/engine/connectors/exareme/converters.ts

...onnectors/exareme/handlers/algorithms/PCA.handler.spec.ts

...ectors/exareme/handlers/algorithms/descriptive.handler.ts

.../handlers/algorithms/linear-regression-cv.handler.spec.ts

...eme/handlers/algorithms/linear-regression.handler.spec.ts

api/src/engine/connectors/exareme/tests/e2e/3c.e2e-spec.ts

...connectors/exareme/tests/e2e/calibration-belt.e2e-spec.ts

api/src/engine/connectors/exareme/tests/e2e/cart.e2e-spec.ts

...ctors/exareme/tests/e2e/descriptiveStatistics.e2e-spec.ts

...c/engine/connectors/exareme/tests/e2e/k-means.e2e-spec.ts

...ine/connectors/exareme/tests/e2e/kaplan-meier.e2e-spec.ts

...nectors/exareme/tests/e2e/logistic-regression.e2e-spec.ts

...gine/connectors/exareme/tests/e2e/naive-bayes.e2e-spec.ts

api/src/engine/connectors/exareme/tests/e2e/pca.e2e-spec.ts

...nectors/exareme/tests/e2e/pearson-correlation.e2e-spec.ts

...nnectors/exareme/tests/e2e/t-test-independant.e2e-spec.ts

...ne/connectors/exareme/tests/e2e/t-test-paired.e2e-spec.ts

...ors/exareme/transformations/algorithms/algorithms.spec.ts

...ne/connectors/exareme/transformations/algorithms/index.ts