chore(workflows): replace hardcoded GH repo URL with variables

[ds-jhartmann]

Description

• replace hardcoded GH repo URL with variables
• choose GH runner for umbrella tests dynamically, depending on the repo

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Test Results

35 tests  +19   35 ✅ +34   5m 22s ⏱️ + 5m 21s
 1 suites ± 0    0 💤 ± 0 
 1 files   ± 0    0 ❌  - 15 

Results for commit de89ec8. ± Comparison against base commit cf0b76a.

This pull request removes 16 and adds 35 tests. Note that renamed tests count towards both.

local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure first level supplier BPNL in investigation job with four level request has been detected correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure first level supplier BPNL in investigation job with several impacted nodes has been detected correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure first level supplier bpnl in investigation job with one level request has been detected correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure first level supplier bpnl in investigation job with three level request has been detected correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure investigation job for globalAssetId with missing BPNS in PartSiteInformationAsPlanned is processed correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure investigation job for globalAssetId with missing PartSiteInformationAsPlanned is processed correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure investigation job with invalid request is handled correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure investigation job with several relationships for valid globalAssetId and BPN is processed correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure investigation job with unknown globalAssetId and valid BPN is processed correctly
local.testing.api-tests.irs-ess-api-tests.tavern.yaml ‑ Make sure investigation job with valid globalAssetId and BPN is processed correctly
…

BomLifecycle 'asPlanned' implementation ‑ End 2 End for BomLifecycle 'asPlanned' Vehicle Model A for BMW [BPNL00000003AYRE]
BomLifecycle 'asPlanned' implementation ‑ End 2 End for BomLifecycle 'asPlanned' Vehicle Model B for MercedesBenz [BPNL00000003AYRE]
BomLifecycle 'asPlanned' implementation ‑ End 2 End for BomLifecycle 'asPlanned' Vehicle Model C for SAP [BPNL00000003AYRE]
IRS Batch Processing ‑ Check correct job executions of batch processing (SingleLevelBomAsBuilt/SerialPart 3.0.0)
IRS Policy Store ‑ Policy Store API:  Update a policy validUntil date for a policy that is associated to multiple BPNs
IRS Policy Store ‑ Policy Store API: Add BPN to policy
IRS Policy Store ‑ Policy Store API: Add policyId to given BPNs
IRS Policy Store ‑ Policy Store API: Delete policy for BPN
IRS Policy Store ‑ Policy Store API: Delete some policies
IRS Policy Store ‑ Policy Store API: Fetching policies by BPNLs should fail for invalid BPNLs (bad case)
…

[ds-lcapellino]

LGTM