[GConstruct] Limit the number of categories to 100

[jalencato]

Issue #, if available:

Description of changes:

• Avoid any shared memory outage because of too many categories.
• GSProcessing will use the count order to to determine the first 100 orders, however, for GConstruct, we process the data in multi-threaded so we can not implement the same logic. For GConstruct, we will select the first 100 categories.

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