Fixed ContainedPartIndex behavior for DisplayText over 255 chars long

[XopcT]

Hi! Currently there is an issue when adding content items with long DisplayText (over 255 chars) as a child list item. Postgres database allowes only 255 chars for ContainedPartIndex.DisplayText column. So this fix truncates long DisplayText to 255 chars, similart to ContentItemIndex behavior

Fixes #16739

[github-actions]

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[XopcT]

@dotnet-policy-service agree

[MikeAlhayek]

@XopcT thanks for this PR. You'll need to agree to the dotnet policy. But also, you'll need to set the same length of the column here

OrchardCore/src/OrchardCore.Modules/OrchardCore.Lists/Migrations.cs

Line 87 in b3c4b46

.AddColumn<string>("DisplayText")

[MikeAlhayek]

adding do not merge label until after dotnet-policy is agreed, then we can merge.

[XopcT]

adding do not merge label until after dotnet-policy is agreed, then we can merge.

Hi! I'm pretty to this repository. How should I agree?

[MikeAlhayek]

I did not realize that you already have.

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[allcontributors]

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