Use openlineage-airflow in airflow example and fix debugging step

[wslulciuc]

This PR updates the examples/airflow to use openlineage-airflow, makes so minor updates to the example steps and fixes the SQL for DAG troubleshooting in step 5.

Fixes #1217

[codecov]

Codecov Report

Merging #1635 (9b0a323) into main (f279518) will decrease coverage by 1.55%.
The diff coverage is 75.86%.

❗ Current head 9b0a323 differs from pull request most recent head 958283b. Consider uploading reports for the commit 958283b to get more accurate results

@@             Coverage Diff              @@
##               main    #1635      +/-   ##
============================================
- Coverage     79.73%   78.17%   -1.56%     
- Complexity      958      980      +22     
============================================
  Files           201      196       -5     
  Lines          5971     5238     -733     
  Branches        410      417       +7     
============================================
- Hits           4761     4095     -666     
+ Misses          773      696      -77     
- Partials        437      447      +10     

Impacted Files	Coverage Δ
api/src/main/java/marquez/MarquezApp.java	60.93% <ø> (ø)
api/src/main/java/marquez/MarquezConfig.java	100.00% <ø> (ø)
api/src/main/java/marquez/api/LineageResource.java	80.00% <ø> (ø)
...src/main/java/marquez/api/OpenLineageResource.java	71.42% <ø> (ø)
api/src/main/java/marquez/common/models/Field.java	71.42% <ø> (+2.67%)	⬆️
...c/main/java/marquez/db/models/DatasetFieldRow.java	0.00% <ø> (ø)
.../main/java/marquez/service/models/DatasetMeta.java	64.28% <ø> (-2.39%)	⬇️
.../src/main/java/marquez/service/models/DbTable.java	100.00% <ø> (ø)
.../main/java/marquez/service/models/DbTableMeta.java	100.00% <ø> (+7.69%)	⬆️
...i/src/main/java/marquez/service/models/Stream.java	75.00% <ø> (ø)
... and 54 more

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