Iris: Merge ingestion jobs

[isabellagessl]

The ingestion jobs for lecture slides and transcriptions are now merged.

• slides and transcriptions can be ingested over the /lectures/fullIngestion path
• If an attachment was already ingested it won't be ingested again
• Lecture unit segment summaries and leture unit summaries are generated for both slides and transcriptions after they were ingested.

To test:

1. Create an AttachmentVideoUnit in Artemis
2. Upload a file (slidedeck) and set a videoSource
3. Upload transcriptions for the Unit under /admin/lecture-transcription-ingestion
   With the id of you AttachemntVideoUnit and the id of the corresponding lecture
   Example transcription:

 {
    "lectureUnitId": 1,
    "language": "en",
    "segments": [
        {
            "startTime": 0.96,
            "endTime": 5.36,
            "text": "Welcome to the second lecture in the course Introduction to Software Engineering.",
            "slideNumber": 1
        },
        {
            "startTime": 5.36,
            "endTime": 11.120000000000001,
            "text": "Today we would like to talk about model-based software engineering from the problem statement",
            "slideNumber": 2
        },
        {
            "startTime": 11.120000000000001,
            "endTime": 17.04,
            "text": "to the potentially shippable product increment that you deliver to your end users.",
            "slideNumber": 3
        }
    ]
}

4. In the management of the course in Artemis ingest the lecture unti
5. See if the ingestion works in the Pyris console output

Screenshots:

1. step

2. step

3. step

4. step

[alexjoham]

Code looks all in all good to me, some small suggestions I would like you to change.

[isabellagessl]

I integrated you feedback, can you have a look again @alexjoham :)

[alexjoham]

One small point but all in all it looks good! Will approve if this is fixed!

[alexjoham]

Code looks good to me! Approved!

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