Backend: Match Ci::BuildNeed name limit with job name limit

Summary

At the moment, no pipelines are created without any notifications of what could have gone wrong when these conditions are met:

• There is a needs relations between two jobs
• The parent job has a matrix (a parallel job)
• The total number of characters of the expanded parent job name exceeds 128.

Proposal

The proposal here is to increase Ci::BuildNeed's name limit to 255 (which matches the job name limit).

NOTE: Since the ci_build_needs.name column is already TEXT, the only thing that needs to be updated is the value of the MAX_JOB_NAME_LENGTH constant from 128 to 255.

Additional details

Some relevant technical details, if applicable, such as:

• Does this need a feature flag?
• Does there need to be an associated instrumentation issue created related to this work?
• Is there an example response showing the data structure that should be returned (new endpoints only)?
• What permissions should be used?
• Is this EE or CE?
  • EE
  • CE
• Additional comments:

Implementation Table

Group	Issue Link
backend	Backend: No pipelines created when matrix var i... (#362262 - closed)
backend	👈 You are here
backend / frontend	Frontend/Backend: Update UI to show variables (#428165)
backend	Backend: Allow Custom Matrix Names (#428169 - closed)

Links/References