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We would appreciate your support to provide us with the current lifecycle status (e.g., Active, NRND, to be discontinued (LTB), Obsolete, Custom) for this part (STM32F107VCT7TR).
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Really you should work through a local sales office, and establish contacts that way.
TR seems like a distributor Tape-n-Reel designations
The 7 is a Temperature rating
You should perhaps look at the 10-Year commitment statement on the STM32 parts/families of interest, and how far those extend into the future.
Generally I would be wary of such promises as many factors may impact the viability/availability of parts, if not for business reasons, one might consider the impact of natural disasters (earthquakes, fire, flood at facilities) and geo-political events.