[VSC-1575] Remove port validation for Jtag; Fix timing bug

[radurentea]

Description

• Remove serial port validation when flashing with JTAG
• Add validation to make sure OpenOCD accepts commands before we try flashing

Fixes #1411

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Steps to test this pull request

• Try to flash a project using JTAG, without selecting a port

There should not be any issues for not selecting a port and there should not be any timing issues between OpenOCD and JTAG Flashing.
Example of timing issue:

Open On-Chip Debugger v0.12.0-esp32-20241016 (2024-10-16-14:17)
Licensed under GNU GPL v2
For bug reports, read
    http://openocd.org/doc/doxygen/bugs.html

debug_level: 2

Info : only one transport 
option; autoselecting 'jtag'
Info : esp_usb_jtag: VID set to 0x303a and PID to 0x1001
Info : esp_usb_jtag: capabilities descriptor set to 0x2000

Info : Listening on port 6666 for tcl connections

Info : Listening on port 4444 for telnet connections

[/OpenOCD]
[Flash]
Failed to flash (via JTag), due to some unknown error in tcl, please try to relaunch open-ocd
[/Flash]
[OpenOCD]
Info : esp_usb_jtag: serial (40:4C:CA:51:3
5:A8)

Info : esp_usb_jtag: Device found. Base speed 24000KHz, div range 1 to 255

Info : clock speed 24000 kHz

Info : JTAG tap: esp32c6.tap
0 tap/device found: 0x0000dc25 (mfg: 0x612 (Espressif Systems), part: 0x000d, ver: 0x0)

Info : [esp32c6] datacoun
t=2 progbufsize=16

Info : [esp32c6] Examined RISC-V core; found 
2 harts
Info : [esp32c6]  XLEN=32, misa=0x40903105
Info : [esp32c6] Examination succeed
Info : [esp32c6] starting gdb server 
on 3333
Info : Listening on port 3333 for gdb connections

Info : accepting 'tcl' connection on tcp/6666
Info : dropped 'tcl' connection

How has this been tested?

As described above

Test Configuration:

• ESP-IDF Version: 5.4
• OS (Windows,Linux and macOS): Windows 11

Checklist

• PR Self Reviewed
• Applied Code formatting
• Added Documentation
• Added Unit Test
• Verified on all platforms - Windows,Linux and macOS

[github-actions]

Download the artifacts for this pull request:
You can test these changes by installing this VSIX by click menu View -> Command Palette..., type Install from VSIX and then select downloaded esp-idf-extension.vsix file to install the extension.

• esp-idf-extension.vsix.zip
  Espressif documentation preview